Replying to Where to mount them

i got a pair of look p 12s and a pair of 06 4 frnts...and was wondering if i should mount them at center or go -2...i searched for something like this but didnt find a direct answer so just thought i would ask...i really ski like 85 percent park..but i do like to go outside the park..but i ski in the east..in massachusetts..so i never really ski powder..just groomers..so what you thin..center or -2?..or could you go inbwtween at -1?