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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... If the second gap is the same size as the first, then the pressure will escape just as quickly as the first gap can let it in.



I don't believe that to be true. ANY pressure buildup will result in unseating the top ring from the ring land. even the piston companies have gotten involved by putting pressure equalization channels between the two top rings to try and help this particialr problem.
I don't think i can expalin it any better than i already have. most ring manufacturers tell you to open the 2nd ring gap now. my experiences over the years have been that opening the 2nd ring gap helps make more power. every engine builder that i know personally does it that way also. I don't think we're all wrong in what we do with regards to ring gaps.