se7en is right! I tried for years to be a cranker. You either are or not. It is that simple. Strength has nothing to do with it. I was a power lifter for years. I could bench 300, squat 330, and dead lift 420. I made the 1000 pound club, but I could not crank a ball worth anything.
The weight block rolling up to the pocket is what worked, that is why a guy with a great arm swing and lift can still throw a pancake block urethane ball and score. That is why a lot of guys on the pro tour back in the 1980's were skeptical about urethane. Back then if you could score with a yellow dot, or an LT 48 soft rubber, that was all you needed.