80 psi is exceptionally good, 60-65 psi is typical, 45-50psi is low.
I'm thinking there is some change in compression with cylinder head changes but I'd have to do more research.
Longer spark plug that consumes more combustion chamber volume - that might gain you a pound or two, shave a few thou off the head and/or shave the deck
Have you checked the timing? How about the mag? Does it give a a good blue spark or a weak yellow spark. I always make sure I have a good ignition system before anything else. Just my 2 cents worth. Come to think of it, that 2 cents in old world money is probably only worth 1/2 a cent . LOL
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