yeah i dont know..maybe it depends mostly on the ski..but i tried silencers (2cm back) then t-halls (center mounted) and the difference was unbelieveable but now that i think of it its prob mostly just the ski
i dont know i think that rails and boxes still feel better with a center mounted ski no matter what..try hitting a rail with a non center mounted ski then switch skis and hit the same rail with a center mounted ski (symmetrical or not) and it just feels alot better...