Had to chime in on this one after reading, a few things.
Did a wet and dry compression run on an engine a few days ago for a guy with some of the highest readings I have ever seen (on pump gas) at 245 psi (dry) on all cylinders with a variable of only 5+/- psi. Engine had 3,000 miles, ran on 87 octane, but had fully adjustable intake and exhaust cam timing. I say "but" because cam timing/design has a lot of effects of cylinder pressure and dynamic compression.