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Mount position is entirely a personal preference thing. I've played with it a bit on my pow boards... and for me, I prefer core centre. I've tried true center but you just end up going over the handlebars a little too often when sending drops, but on a proper pow ski with loads of rocker and a big shovel, you don't need to be mounted back to get float. In fact going forward with the mount means it's easier for me to push the tips under for instant whiteroom faceshot goodness.
Being centred, and having a symmetrical ski, means the swing weight (and general weight of the ski) is more balanced, meaning it's generally more stable and maneuverable in the air. I also find it easier to pivot on a ski mounted closer to the centre, particularly in trees or tight spots like narrow chutes.
the whole point of the symetrical skis are to ride switch the same as foward with the same feeling and if you center mount them, they are weighted perfectly! whatever everyone else says is just crap! thats the reasons. however, if you are a skier who just wants to shred hard, just get the skies for you! the suspects are not symetrical, the AR7's arent symetrical, and they are 2 of the best park skies out there!
you can shred any twin tip which is a decent ski and you will not notice if the are symetrical or not