I tried my friend’s 30” Schmelke KW shaft on one of my cues. As far as touching the cue ball because of length, I don’t know why that would happen because of a 1” longer shaft. You use the same bridge length, right? You don’t change you bridge because the shaft is 1” longer. You place your hands on the cue grip where the balance feels right and pretty similar to where you’d normally position your hand to grip the cue. The 30” shaft is basically what I’d describe as a translucent change meaning you won’t see much difference aside from a little added front weight which could possibly become a good thing.