As Mo P likes to remind people all balls are asym after being drilled. Just realized you can easily get any symmetric ball with the right drilling up to .02 to .025 int diff especially if add a double thumb hole. That is route I am taking on my Venom Shock as already have an IQ Tour drilled fairly mild to fall back on. I may end up retroactively putting a double thumb on several balls I already have drilled. Drilling really helps those of us on the ends of the spectrum as far as speed (me) or rev dominant imo. Added that far too late to my game. Oh well.