I find that I have greater success with weaker symetric cores and mild covers. My faves have been a Sonic X pearl and a Liberator. Both balls were drilled with basic pin next to ring finger drillings. I'll alter surface to match up with oil length and volume. With weaker asymetrics I have gone with mass bias on the left side of the thumbhole (RH). This isn't an option with most of the newer asymetrics. Unless you have a lot more speed than me (16 mph), the stronger stuff will hook too violently to control. At least on a house shot, weaker balls with basic drills are better for no thumbers.
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Why does everyone laugh when I bowl?
louie