From what I've heard, somewhere around 60%-70% of ball reaction is in the cover, depending on how "dynamic" the core is in comparison to the core.
Theory 1 (I'm not sure):
For example, the Reactor is on the Domination and the T-Struck Pearl. The core is stronger in the Domination, so the same surface change would effect the overall reaction more in the reaction of the T-Struck Pearl.
OR
Theory 2:
Theory 1 blows and the cover is the bigger piece in the reaction puzzle no matter what core is in the ball.
Either way, the core has NEVER been more of a factor than the cover...you know, because it touches the lane and all.
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I need more revs...and more weight. I mean, 15# is fine, but 135# doesn't do me any favors!!!