Is it possible to tune up shafts to match the butt? I have a matched set of Runde shafts that make the cue nose heavy. Both are full 13mm, 4.3oz with lots of meat in the bottom half of the shafts. I was hoping to get some fat trimmed off the shafts, maintain stiffness if not stiffer than they already are, and hopefully pull the balance point a bit. I have another shaft that has the attributes I like, but is 12.4. Is this possible and still maintain the 13mm?