AFAIHL (As far as I have learned)
For asymmetrics, pin distance of around 2 3/4" to 6 1/2", all provide maximum flare.
For drilling length, people seem to recommend 1 1/2" - 2 1/2" pin-PAP distances. (My problem with that is unless you have firmer balls peed, that also lowers the drilled RG, making the ball attempt to get into a roll earlier.)
For pin stances of max flare, 2.75" - 6.5", they can be be further divided into (my terminology is how I understand it, not as a technician might explain it) 2 categories: 2.75/3" - 4.5", roughly, and 4.5" - 6.5".
For pin-PAP distances of 4.5-6.5", after the breakpoint, the ball tends to go into a strong forward roll. This makes these drillings more suitable, in my mind) for playing direct, or an outside like. This also makes them unsuitable for playing a deep inside line (there seems to be less continuation.)
For pin-PAP distances of 2.75/3" - 4.5", the motion after the breakpoint is more side to side, (not exactly side to side, but to my mind, more normal) with more continuation. This makes such drilling more suitable for playing deeper inside lines.
I kind of proved this to myself with a Roto-Grip Theory. Not realizing all of the above, I put the pin over the bridge, about 5.5" pin-PAP for me. Even polished, playing inside the 3rd arrow, I left 10 pin after 10 pin; the ball had little continuation of drive. I re-drilled it pin in ring finger, about a 4" pin-PAP for me. That made all the difference in the world. It was like a ball re-born. It had strong, strong continuation from as deep a I needed.