I have had this ball for around 4 years. Not sure about drilling.
Me-Stroker with med speed and high revs.
Ball-15 lb.-polished
I have thrown this ball in the flood...the dry...and everywhere in between. For a long time it was the ONLY ball I used. I am not a high average bowler-175 or so, but this ball will move in oil, on the dry, whatever. It may be the drilling, but I can use this ball anytime. In the oil I line up around 15 and roll 10 to 5 with a screaming backend. In the dry I line up 20 or a little deeper and throw 15 to about 5 with the same results. Very few 10's and the ball hits like a truck. Carries everything...light...high...whatever. The only problem I ever have with this ball is the idiot rolling it. Even with wannabebowler rolling it, it is very forgiving.