Replying to Kartel 108 question

Im Getting a pair of Kartel 108s and was wondering if anyone on NS who has them or has skied them could tell me how they skied and where the prime mounting position was for them. I ski all mountain and want this to be more of a powder oriented ski, I ski with my friends and we ski around finding natural jumps and features to practice tricks on like 3s, 7s, backflips and corks with grabs. I will rarely take this in the park so where should I mount? I was thinking -3 because -4.5 seems too far back to rn playful and jibby