Need information related to apartment maintenance calculation

Dear Sir , I stay in an Apartment consisting of 223 flats (80 , 3 BHK and 143 , 2 BHK ) , Here we paid equal amount to purchase Amenities from builder . Flat size varies between 2 bhk of 747 to 3 bhk of 1590 sft . All 2 BHK owners are enjoying equally all facilities as 3 BHK owners , but when it comes to pay maintenance the committee has decided on a Fixed plus variable approach which is now used in most of the big societies (Where there was a difference of 600 per month between average size 2 bhk and 3 bhk and almost 1100 rs difference was there between small 2 bhk and 3 bhk ) But In one meeting some of 2 BHK owners asked for Pure SFT calculation and asked for Poll . Naturally They own the poll being 63 more in number . When Corridors, gardens, Roads, gym , pool play area are equally enjoyed by all is it justifiable to take Purely Per SFT charge asking More than two times maintenance . 3 BHk owners are ready to pay more but not double . Plz Suggest your view ...