enhanced conservative solution:

M1: ~LOWALTOPS*LOWELEVDIFF*~LOWSNOWFEB*~NOSNOWMAKING + LOWALTOPS*LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING +
    LOWALTOPS*LOWSNOWFEB*~NOREPLACEMENT*~HIGHCOMPETITION + LOWALTOPS*LOWSNOWFEB*~NOSNOWMAKING*~HIGHCOMPETITION +
    LOWELEVDIFF*~NOREPLACEMENT*NOSNOWMAKING*~HIGHCOMPETITION + ~LOWELEVDIFF*LOWSNOWFEB*NOREPLACEMENT*~NOSNOWMAKING*~HIGHCOMPETITION -> ~LSAP

                                                                         inclS   PRI   covS   covU  
--------------------------------------------------------------------------------------------------- 
1                      ~LOWALTOPS*LOWELEVDIFF*~LOWSNOWFEB*~NOSNOWMAKING  0.950  0.950  0.062  0.039 
2                    LOWALTOPS*LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING  0.979  0.979  0.053  0.023 
3                  LOWALTOPS*LOWSNOWFEB*~NOREPLACEMENT*~HIGHCOMPETITION  0.947  0.947  0.115  0.035 
4                   LOWALTOPS*LOWSNOWFEB*~NOSNOWMAKING*~HIGHCOMPETITION  0.841  0.841  0.065  0.021 
5              LOWELEVDIFF*~NOREPLACEMENT*NOSNOWMAKING*~HIGHCOMPETITION  0.905  0.905  0.098  0.043 
6  ~LOWELEVDIFF*LOWSNOWFEB*NOREPLACEMENT*~NOSNOWMAKING*~HIGHCOMPETITION  0.883  0.883  0.020  0.001 
--------------------------------------------------------------------------------------------------- 
                                                                     M1  0.912  0.912  0.274 

                                                                         cases 
------------------------------------------------------------------------------ 
1                      ~LOWALTOPS*LOWELEVDIFF*~LOWSNOWFEB*~NOSNOWMAKING  Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Champex_Le_Revers,Leukerbad_Erli,Verbier_Les_Moulins;
                                                                         Realp_Realp; Buerchen_Blatt
2                    LOWALTOPS*LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING  Lantsch_Lenz_Lenz; Airolo_Luevina,Villars_Palace; Gaehwil_Gaehwil; Jaun_Oberbach,Klosters_Doggiloch_Selfranga,La_Forclaz_Teleski_des_Thays,Sainte_Croix_Mont_des_Cerfs
3                  LOWALTOPS*LOWSNOWFEB*~NOREPLACEMENT*~HIGHCOMPETITION  Fluehli_Thorbach_Blasenegg; Appenzell_Appenzell_Sollegg,Habkern_Habkern_Sattelegg,La_Tour_de_Treme_La_Chia,Prato_Prato_Dalpe,Rothenthurm_Biberegg_Neusell,Urnaesch_Soelzer_Osteregg,Vorderthal_Vorderthal_Dorlaui;
                                                                         Gaehwil_Gaehwil; Krinau_Nordkrinau_bei_Lichtensteig,Les_Verrieres_Croix_Blanche_Paturage_de_lEnvers,Nods_Pierre_Grise_1,Sternenberg_Sternenberg
4                   LOWALTOPS*LOWSNOWFEB*~NOSNOWMAKING*~HIGHCOMPETITION  Fluehli_Thorbach_Blasenegg; Oberwil_Rossberg_Ankersboden; Gaehwil_Gaehwil; Bagnes_Dzora,Fischingen_Hoechi_Oberwangen,Lauenen_Rohrbruecke_Bruechli,Mauborget_Mauborget,St._Gallen_Beckenhalde
5              LOWELEVDIFF*~NOREPLACEMENT*NOSNOWMAKING*~HIGHCOMPETITION  Bedretto_Cioss_Prato,Mutten_Obermutten,Pontresina_San_Spiert_Cluex,Saas_Balen_Boden_Fellmatte,Tenna_Tenna;
                                                                         Piazzogna_Alpe_di_Neggia; Gadmen_Gadmen; Krinau_Nordkrinau_bei_Lichtensteig,Les_Verrieres_Croix_Blanche_Paturage_de_lEnvers,Nods_Pierre_Grise_1,Sternenberg_Sternenberg
6  ~LOWELEVDIFF*LOWSNOWFEB*NOREPLACEMENT*~NOSNOWMAKING*~HIGHCOMPETITION  Pany_Pany_Luzein; Oberwil_Rossberg_Ankersboden
------------------------------------------------------------------------------ 

enhanced parsimonious solution:

M1: ~LOWALTOPS*~NOSNOWMAKING + ~NOSNOWMAKING*~HIGHCOMPETITION + LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING + LOWELEVDIFF*~NOREPLACEMENT*~HIGHCOMPETITION +
    (LOWALTOPS*~NOREPLACEMENT*~HIGHCOMPETITION) -> ~LSAP 
M2: ~LOWALTOPS*~NOSNOWMAKING + ~NOSNOWMAKING*~HIGHCOMPETITION + LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING + LOWELEVDIFF*~NOREPLACEMENT*~HIGHCOMPETITION +
    (LOWSNOWFEB*~NOREPLACEMENT*~HIGHCOMPETITION) -> ~LSAP 

                                                                     ------------------- 
                                                inclS   PRI   covS   covU   (M1)   (M2)  
---------------------------------------------------------------------------------------- 
1                    ~LOWALTOPS*~NOSNOWMAKING  0.906  0.906  0.075  0.009  0.009  0.009 
2              ~NOSNOWMAKING*~HIGHCOMPETITION  0.889  0.889  0.106  0.041  0.041  0.041 
3    LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING  0.988  0.988  0.090  0.030  0.030  0.030 
4 LOWELEVDIFF*~NOREPLACEMENT*~HIGHCOMPETITION  0.929  0.929  0.137  0.033  0.036  0.040 
---------------------------------------------------------------------------------------- 
5    LOWALTOPS*~NOREPLACEMENT*~HIGHCOMPETITION  0.927  0.927  0.131  0.004  0.039        
6   LOWSNOWFEB*~NOREPLACEMENT*~HIGHCOMPETITION  0.949  0.949  0.120  0.002         0.037 
---------------------------------------------------------------------------------------- 
                                            M1  0.915  0.915  0.304 
                                            M2  0.915  0.915  0.302 

                                                cases 
----------------------------------------------------- 
1                     ~LOWALTOPS*~NOSNOWMAKING  Pany_Pany_Luzein; Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Champex_Le_Revers,Leukerbad_Erli,Verbier_Les_Moulins;
                                                Realp_Realp; Buerchen_Blatt
2               ~NOSNOWMAKING*~HIGHCOMPETITION  Pany_Pany_Luzein; Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Realp_Realp; Fluehli_Thorbach_Blasenegg;
                                                Oberwil_Rossberg_Ankersboden; Lantsch_Lenz_Lenz; Gaehwil_Gaehwil; Bagnes_Dzora,Fischingen_Hoechi_Oberwangen,Lauenen_Rohrbruecke_Bruechli,Mauborget_Mauborget,St._Gallen_Beckenhalde
3     LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING  Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Champex_Le_Revers,Leukerbad_Erli,Verbier_Les_Moulins; Lantsch_Lenz_Lenz;
                                                Airolo_Luevina,Villars_Palace; Gaehwil_Gaehwil; Jaun_Oberbach,Klosters_Doggiloch_Selfranga,La_Forclaz_Teleski_des_Thays,Sainte_Croix_Mont_des_Cerfs
4  LOWELEVDIFF*~NOREPLACEMENT*~HIGHCOMPETITION  Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Bedretto_Cioss_Prato,Mutten_Obermutten,Pontresina_San_Spiert_Cluex,Saas_Balen_Boden_Fellmatte,Tenna_Tenna;
                                                Piazzogna_Alpe_di_Neggia; Lantsch_Lenz_Lenz; Gadmen_Gadmen; Gaehwil_Gaehwil; Krinau_Nordkrinau_bei_Lichtensteig,Les_Verrieres_Croix_Blanche_Paturage_de_lEnvers,Nods_Pierre_Grise_1,Sternenberg_Sternenberg
----------------------------------------------------- 
5    LOWALTOPS*~NOREPLACEMENT*~HIGHCOMPETITION  Fluehli_Thorbach_Blasenegg; Appenzell_Appenzell_Sollegg,Habkern_Habkern_Sattelegg,La_Tour_de_Treme_La_Chia,Prato_Prato_Dalpe,Rothenthurm_Biberegg_Neusell,Urnaesch_Soelzer_Osteregg,Vorderthal_Vorderthal_Dorlaui;
                                                Lantsch_Lenz_Lenz; Gadmen_Gadmen; Gaehwil_Gaehwil; Krinau_Nordkrinau_bei_Lichtensteig,Les_Verrieres_Croix_Blanche_Paturage_de_lEnvers,Nods_Pierre_Grise_1,Sternenberg_Sternenberg
6   LOWSNOWFEB*~NOREPLACEMENT*~HIGHCOMPETITION  Piazzogna_Alpe_di_Neggia; Fluehli_Thorbach_Blasenegg; Appenzell_Appenzell_Sollegg,Habkern_Habkern_Sattelegg,La_Tour_de_Treme_La_Chia,Prato_Prato_Dalpe,Rothenthurm_Biberegg_Neusell,Urnaesch_Soelzer_Osteregg,Vorderthal_Vorderthal_Dorlaui;
                                                Gaehwil_Gaehwil; Krinau_Nordkrinau_bei_Lichtensteig,Les_Verrieres_Croix_Blanche_Paturage_de_lEnvers,Nods_Pierre_Grise_1,Sternenberg_Sternenberg
----------------------------------------------------- 

enhanced intermediate solution:


From C1P1: 

M1:    ~NOSNOWMAKING*~HIGHCOMPETITION + ~LOWALTOPS*~LOWSNOWFEB*~NOSNOWMAKING + LOWALTOPS*~NOREPLACEMENT*~HIGHCOMPETITION +
       LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING + LOWELEVDIFF*~NOREPLACEMENT*~HIGHCOMPETITION -> ~LSAP 

                                                inclS   PRI   covS   covU  
-------------------------------------------------------------------------- 
1               ~NOSNOWMAKING*~HIGHCOMPETITION  0.889  0.889  0.106  0.045 
2         ~LOWALTOPS*~LOWSNOWFEB*~NOSNOWMAKING  0.951  0.951  0.064  0.007 
3    LOWALTOPS*~NOREPLACEMENT*~HIGHCOMPETITION  0.927  0.927  0.131  0.039 
4     LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING  0.988  0.988  0.090  0.032 
5  LOWELEVDIFF*~NOREPLACEMENT*~HIGHCOMPETITION  0.929  0.929  0.137  0.036 
-------------------------------------------------------------------------- 
                                            M1  0.917  0.917  0.302 

                                                cases 
----------------------------------------------------- 
1               ~NOSNOWMAKING*~HIGHCOMPETITION  Pany_Pany_Luzein; Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Realp_Realp; Fluehli_Thorbach_Blasenegg;
                                                Oberwil_Rossberg_Ankersboden; Lantsch_Lenz_Lenz; Gaehwil_Gaehwil; Bagnes_Dzora,Fischingen_Hoechi_Oberwangen,Lauenen_Rohrbruecke_Bruechli,Mauborget_Mauborget,St._Gallen_Beckenhalde
2         ~LOWALTOPS*~LOWSNOWFEB*~NOSNOWMAKING  Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Champex_Le_Revers,Leukerbad_Erli,Verbier_Les_Moulins; Realp_Realp;
                                                Buerchen_Blatt
3    LOWALTOPS*~NOREPLACEMENT*~HIGHCOMPETITION  Fluehli_Thorbach_Blasenegg; Appenzell_Appenzell_Sollegg,Habkern_Habkern_Sattelegg,La_Tour_de_Treme_La_Chia,Prato_Prato_Dalpe,Rothenthurm_Biberegg_Neusell,Urnaesch_Soelzer_Osteregg,Vorderthal_Vorderthal_Dorlaui;
                                                Lantsch_Lenz_Lenz; Gadmen_Gadmen; Gaehwil_Gaehwil; Krinau_Nordkrinau_bei_Lichtensteig,Les_Verrieres_Croix_Blanche_Paturage_de_lEnvers,Nods_Pierre_Grise_1,Sternenberg_Sternenberg
4     LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING  Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Champex_Le_Revers,Leukerbad_Erli,Verbier_Les_Moulins; Lantsch_Lenz_Lenz;
                                                Airolo_Luevina,Villars_Palace; Gaehwil_Gaehwil; Jaun_Oberbach,Klosters_Doggiloch_Selfranga,La_Forclaz_Teleski_des_Thays,Sainte_Croix_Mont_des_Cerfs
5  LOWELEVDIFF*~NOREPLACEMENT*~HIGHCOMPETITION  Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Bedretto_Cioss_Prato,Mutten_Obermutten,Pontresina_San_Spiert_Cluex,Saas_Balen_Boden_Fellmatte,Tenna_Tenna;
                                                Piazzogna_Alpe_di_Neggia; Lantsch_Lenz_Lenz; Gadmen_Gadmen; Gaehwil_Gaehwil; Krinau_Nordkrinau_bei_Lichtensteig,Les_Verrieres_Croix_Blanche_Paturage_de_lEnvers,Nods_Pierre_Grise_1,Sternenberg_Sternenberg
----------------------------------------------------- 


From C1P2: 

M1:    ~NOSNOWMAKING*~HIGHCOMPETITION + ~LOWALTOPS*~LOWSNOWFEB*~NOSNOWMAKING + LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING +
       LOWELEVDIFF*~NOREPLACEMENT*~HIGHCOMPETITION + LOWSNOWFEB*~NOREPLACEMENT*~HIGHCOMPETITION -> ~LSAP 

                                                inclS   PRI   covS   covU  
-------------------------------------------------------------------------- 
1               ~NOSNOWMAKING*~HIGHCOMPETITION  0.889  0.889  0.106  0.045 
2         ~LOWALTOPS*~LOWSNOWFEB*~NOSNOWMAKING  0.951  0.951  0.064  0.007 
3     LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING  0.988  0.988  0.090  0.032 
4  LOWELEVDIFF*~NOREPLACEMENT*~HIGHCOMPETITION  0.929  0.929  0.137  0.040 
5   LOWSNOWFEB*~NOREPLACEMENT*~HIGHCOMPETITION  0.949  0.949  0.120  0.037 
-------------------------------------------------------------------------- 
                                            M1  0.917  0.917  0.300 

                                                cases 
----------------------------------------------------- 
1               ~NOSNOWMAKING*~HIGHCOMPETITION  Pany_Pany_Luzein; Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Realp_Realp; Fluehli_Thorbach_Blasenegg;
                                                Oberwil_Rossberg_Ankersboden; Lantsch_Lenz_Lenz; Gaehwil_Gaehwil; Bagnes_Dzora,Fischingen_Hoechi_Oberwangen,Lauenen_Rohrbruecke_Bruechli,Mauborget_Mauborget,St._Gallen_Beckenhalde
2         ~LOWALTOPS*~LOWSNOWFEB*~NOSNOWMAKING  Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Champex_Le_Revers,Leukerbad_Erli,Verbier_Les_Moulins; Realp_Realp;
                                                Buerchen_Blatt
3     LOWELEVDIFF*~NOREPLACEMENT*~NOSNOWMAKING  Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Champex_Le_Revers,Leukerbad_Erli,Verbier_Les_Moulins; Lantsch_Lenz_Lenz;
                                                Airolo_Luevina,Villars_Palace; Gaehwil_Gaehwil; Jaun_Oberbach,Klosters_Doggiloch_Selfranga,La_Forclaz_Teleski_des_Thays,Sainte_Croix_Mont_des_Cerfs
4  LOWELEVDIFF*~NOREPLACEMENT*~HIGHCOMPETITION  Bourg_Saint_Pierre_Lorette,San_Bernardino_Pian_Cales; Bedretto_Cioss_Prato,Mutten_Obermutten,Pontresina_San_Spiert_Cluex,Saas_Balen_Boden_Fellmatte,Tenna_Tenna;
                                                Piazzogna_Alpe_di_Neggia; Lantsch_Lenz_Lenz; Gadmen_Gadmen; Gaehwil_Gaehwil; Krinau_Nordkrinau_bei_Lichtensteig,Les_Verrieres_Croix_Blanche_Paturage_de_lEnvers,Nods_Pierre_Grise_1,Sternenberg_Sternenberg
5   LOWSNOWFEB*~NOREPLACEMENT*~HIGHCOMPETITION  Piazzogna_Alpe_di_Neggia; Fluehli_Thorbach_Blasenegg; Appenzell_Appenzell_Sollegg,Habkern_Habkern_Sattelegg,La_Tour_de_Treme_La_Chia,Prato_Prato_Dalpe,Rothenthurm_Biberegg_Neusell,Urnaesch_Soelzer_Osteregg,Vorderthal_Vorderthal_Dorlaui;
                                                Gaehwil_Gaehwil; Krinau_Nordkrinau_bei_Lichtensteig,Les_Verrieres_Croix_Blanche_Paturage_de_lEnvers,Nods_Pierre_Grise_1,Sternenberg_Sternenberg
----------------------------------------------------- 