Another point is that you don't have to use the full finger insert. You can drill the hole shallower and cut the bottom part of the insert off. You really only need the insert to be long enough so you can't feel the bottom of the insert when you put your finger in. With shallower holes you have more choices for lateral pitch and more adjustability for static weights.
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Moon
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So many questions, so little time but I'm having fun.

I use 1/4" bridge on everything and never had any problems.  If installing grips, I use 3/8" lateral on middle finger and 1/2" on ring...  if no grips, I use 3/8" for both.  I would recommend trying to track down a copy of Bill Taylors "Fitting and Drilling a Bowling Ball."  Its quite old, but in general its very informative...  It explains in detail a lot of the pitch related questions.  

S^2
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"The Patriots strength got debacled."

-Emmitt Smith 2/4/08