Joe, the reason you don't see a difference there, is because you're looking at too large of windows from the two control groups. If you just take 1925, and just take 1926, you'll find that :
BA in the AL dropped 11 points
BA in the NL dropped 12 points
Homers in the NL fell by 31 %
Homers in the AL fell by 20 %
AL OBP fell from .360 to .351
NL OBP fell from .348 to .338
AL SLG fell from .408 to .392
NL SLG fell from .414 to .386
The cushioned cork center definately had an impact.
As far as I know, nothing was done to the ball after '26 (until '30 NL) and the offenses stormed right back. '26 was the beginning of Babe's second reformation. Coincidence, I think not

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