I think I may have what you need.
I was having problems with short 28' oiling and/or wild backends. Really wild - my shot was looking like Tim Mack's. I was already considering a pin on pap drill.
Constantine kindly suggested a 5 1/2 pin from pap with cg as close to pap as possible. I drilled up a monster red just the other night. The lanes were oiled 28' (manager is a friend), mild backends (stripper ratio approx 6:1), 4 of us shot about 5 games each. After that, I had the ball drilled and went testing. It came to 5 1/2 x 3 1/2. Drilling took about 30 min. And I was able to squeeze in another two games. It is summer here now and the temp is high even in the center - about 29/28 c. Needless to say, except for the first 15 feet the lane was dry.
All I can say is I now have a reactive ball with a urethane move. The ball was breaking at around 38-40 feet. with a nice small smooth hook. I felt that with this reaction I could take out most splits confindently. It was that predictable. I had an orange dot, and the board difference was only 8 boards. My current speed is about 15 mph, hi track (5 5/8 east, 1/2 north), about 280-300 revs.
Hope this helps, and many thanks to Constantine.
Regards
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What do you mean "its illegal to use my bowling ball for duckpins"? Heck, there goes the 900 series
DARK BEER IT IS THEN!