I've just finished my last experiment with dual angles and decided to post what I think is the bottom line. Each of us probably have a PSA/dual angle combination that optimizes our abilities.
I say it, but can't really prove it. Anything I might say will be denied by everyone who has experienced something different or claims they have.
What I've discovered for myself, as I use combinations that get farther away from what works best, my balls lose versatility and I need to become much more precise in my release to make them perform.
I've always been able to take any ball that basically fits me and make that ball work. However, by taking balls that fit me perfectly and drilling them with exotic combinations, I can almost make a ball unusable.
I don't think that the details are important. Symmetric, asymmetric, high-RG, low-RG, Diff, balance hole positions, etc. For each of us, based on our PAP, have a drilling combination that orientates the core of a ball in an optimal position. It's why we can all go back through our ball histories and remember balls that we loved.
The opposite is also true. We can all go back through our ball history and remember balls that we never had confidence in or simply performed poorly.
I've discovered for myself that angle sums from 90 degrees to 110 degrees are my limit. It doesn't matter what the surface is, what the RG is, what the Diff is, once I break that rule, no matter what brand or model I throw, it becomes a lot of work to make that ball perform.
My recommendation, take your favorite ball and find out what it's core orientation is to your PAP and write that information down. The next time you get ready to buy a new ball and have it drilled, ask yourself this; If I orientate the core on the new ball similar to an old ball, why am I buying a new ball?
So after experimenting with a dozen balls and spending $1,500, what am I going to be using going forward? A 15 pound Storm Hy-Road drilled 50 x 5 x 50 and a 15 pound Storm Tropical Breeze drilled 60 x 5 x 50.
For my next miracle, I'm going to buy a urethane ball and see if everything I read about urethane is hype :-)
For anyone else who would like to experiment there's an Excel spreadsheet floating around that will convert PSA parameters to dual angle and vice versa. You'll quickly discover that any claim one method is better than another is just 'More hype' :-)
If you can't find the spreadsheet, I'll post the formulas that can be plugged into any Excel spreadsheet.