can you rev, heavier objects have more MOMENTUM, they do not fall faster. Everyone muscles the ball to some extent, There is no way that you can bowl without somewhat muscling the ball. Many pro's even muscle the ball a ton, which leads me to believe that people make a bigger deal out of this than it should be.
Back to 14 versus 15, 14's will probably lead to a bit less carry, but if you are tiring after many games, it might increase your scores as you will score better in the later games.
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stanski