The purpose of changing to a higher grit and adding polish isn't to take away back end but rather to delay it. Example; Let's say you want the ball to start it's break at 45 feet. When you throw it it skids through to about that distance. Since it is skidding the rate of friction is low. It's like rubbing your hands together with baby oil on them. As you rub your hands together the baby oil goes away due to the added friction. Soon you feel the heat build between your hands. How long did it take? Now do that same without any oil or less oil. What happens? Your hands heat up faster than they did with the baby oil. The scientific formula for all this decides the end number, coefficient of friction.
So any way, while your ball is skidding it is storing that energy and as it goes the amount of friction between the ball and lanes increases (even with the oil). Once the ball skids past the oil pattern the friction increases greatly creating the hook phase. Here is where the ball changes direction. Once the ball speed and rotation speed equalize the ball enters the roll phase and hopefully powers through the pocket.
This is why if you increase your revs and leave the axis tilt the same, the ball will skid longer. Less revs with that same rotation and it enters the hook phase sooner. This is if the ball speed and all other possible variables are the same.
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