Replying to ARV mounting

im 6 feet 150 lbs, good skiing ability. i have the 185cm armada ARV 05/06. im mounting them with this years look px12. i ski whistler/blackcomb, and i will be about 65% park,  35% pow/steeps etc. so how far forward from suggested shall i mount them? i want to be able to rip it in the park, and do some backwards powder action, but i still want to be able to ski regularily and hit up the powder as much as i can. thanks for your help guys.