You may be right about contact versus actual energy. How about this...if you take two bats, one a 34oz and one a 40oz, chances are good that the hitting surface at the sweet spot is larger at the sweet spot of the 40oz. If you then cork the 40oz so that it swings like a 34oz, you have the velocity of swinging a 34oz with the hitting area of a 40oz. I agree that you can wait later on your swing but I'm also wondering how the cork affects the rebound/trampoline affect of the bat as the ball and bat meet. (and when we say cork, it could be rubberball shavings etc.). Quite possibly the bat now has more give at the core and creates more return energy.
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