The drilling would IMHO depend on the reaction and utility you want to achieve? Do you need a ball that works better on long/heavy oil (can be tough for low trackers/spinner-type players), or what?
Besides, I'd look at the overall ball-and-setup package to achieve thsi utility, not just "a layout that works". Works for what?
If you want to raise your track/PAP, I'd check your wrist strength and hand position during the release. The Jowdy method of leading/pushing the ball with the ring finger all though the release is really helpful, but tough in the beginning when you are not used to keep your wrist firm and stable behind the ball. Most low tracker either stay with their thumb in the ball for too long, releasing the ball "on top of it" instead of letting ot roll across the fingertips forward, or the wrist breaks back in the downswing so that thumb and finger release the ball pretty simultaneaously. That must not be a bad thing - if it works for you, that's fine.