I mounted mine at 1 cm behind dead center and I ride motherships. Its super sick cus spinning is easy and riding pow (which is what I do for the most part) is super responsive and easier than most people would have you believe. I've had people tell me that I'm just going to sink but you lean back a bit and POP!
you don't want them exact center mount unless you want to spend most of your time in the park and ride a lot of switch...youll be able to make turns easier a little bit behind center
i have 174 pe's from last year. they're mounted pretty far back and i defiantly want to mount forward. i ride a mountain creek so its like basically mostly park but some freeriding on the mtn and some pow days but not really. should i mount a cm back or just go for core center? hard ass decision
if your gonna ride park all year, mount them in the center!!! it helps so much for switch riding and rails, especially if your doin switchups. the only down side is that it sucks for powpow, it all just depends on what your gonna do