I've started playing Billiards recently and even though I should use a constant taper shaft (down to 11-12mm) typically used for Billiards, I am using a stiff shaft with a 12.75 tip and a med./hard Triangle tip. What amount of rounding should a "normal" tip have for use in Billiards, a "nickel" or "dime" radius? We are playing on almost new Simonis 760 cloth on a 5x10 table and hitting the balls quite hard to sometimes get 7 rails.