You are only looking at the shape of the shot, not the energy retention of the ball. The only requirement that the USBC has in terms of oil patterns is that there has to be a minimum of three units of oil from gutter to gutter. When you take a urethane bowling ball without much ball speed, whether it is hooking or going straight, it will hit like a toasted marshmallow if it is set down in the dirt. The problem with lane conditions that are "too dry" is that bowlers still insist on playing blackjack: standing on twenty and hitting ten!
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