core center is NOT true center of the ski obv, its +7.5 from standered mounting point, or -4.5 from true center, id say go core for all mountain cuz its still pretty close to the center of the ski, but also back for all mountain, i put my bindings at core center for my PEs and i couldnt have done anything different than that cuz it owns mad nubs bro.  oh yeah, since u have fujis, K2's core center is +7.5