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I still don't understand why it would behave any differently with a bigger 2nd gap than a same-size 2nd gap...

Well, the science of it may not be understood, but SpeedPro did some tests and the results are the bottom line. Does anyone have that link to the SpeedPro tests? Brad, perhaps check their web site.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1