For the first question you either need to go Mindreader.com (jk) or go back to the pro shop and ask the driller. My guess would be that either he likes balls with a skid / flip reaction, or most of his other customers want skid / flip reactions.
A balance hole in addition to the finger and thumb holes can be drilled for one of three reasons; to make the ball USBC compliant, to make the ball more aggressive ( the so called get back hole), or to make the ball less aggressive. If the "get back hole" is drilled in the right spot it will make visible change in the ball reaction.
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