moving right won't slow you down, but will get the ball to react better if you are throwing too fast. I find the easiest way to slow yourself down is to move a half step closer to the foul line. This get you to take smaller steps, and therefore slows you down. Otherwise, try lowering the ball on your push away. Some poeple push the ball straight out from their chest, they can slow the ball speed down by pushing it out at more of a 75 degree angle instead of 90 degrees. Best of luck!
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