if you're talking two cm back from true center not core center you won't notice much of a difference spinning or on rails too much. your swing weight will be a little off. i've found it easier to spin at true center. but it's not that bad at 2 cm back. but they aren't going to like riding switch very much. at all. i would just mount them up true center. but that's all i've been riding for the past 5 or 6 years so i'm used to it. and i can charge WAY harder on true center skis than i can on skis mounted back. it's all personal preference. i mounted my caylors 1cm back from center and it's okay but i regret not mounting them true center. as far as hucking cliffs goes i like center mount better. more tail to support me when i land backseat. two back isn't going to make a huge difference for this but the skis will ride differently. i charge hard on true center skis and have no issues. but that's what i'm used to.