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On my ar6's there are two lines, one that says "-5 (recommended)" and then a second line with "-2.5". So I guess their recommended position is -5 from true center.
For the poster, around -2.5 sounds perfect, if I understand correctly then you're not exactly all about park, and like to ski elsewhere too. Hence a little further back will be fine. If anyone says a centermount won't affect your all mountain skiing then they're wrong. Thats a fact. And keep in mind, 2.5 cm really isn't all that much. Having them back a little will not really affect your park skiing much.
I say go -2.5.