keep the pin close to the center line (not necessarily on it) either above or below the fingers and the bomb about 1 to 1.5" right of the center line. This will give u the desired reaction. If the length is too long you can punch a weighthole 5" over on the midline.

Here's a tip too. Don't drill the fingers too deep, the deeper you go the more of the core you take out. Utilizing more of the core will maximize the differential. Giving you that sweet back end read.
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Paul Smith
04/05 PBA West Region Rookie of the Year
Ebonite Regional Staff
"Bowl to Win"