strike domination, i only select balls that have the pin, cg, and mass bias indicator in a straight line. secondly, i'm more of an old school type player. i don't live in the pro shop or excessively fiddle around with exotic layouts. my pro shop man simply drills the equipment the way i ask and i go try it out. i probably make a change or two in the surface of the ball and go. i don't change balls as often as i change my angle of attack, ball speed, axis of rotation, etc.