There's people out there running alot less squish than they think, for years and without an issue.
Test a saw with .033 solder by rocking the flywheel back and forth over TDC and solder through plug hole over the pin.
Then repeat with .024 solder.
Then take a drill, add a 1/4" extension and a socket that fits the flywheel crank nut, use .024 solder, and spin it over for 30 full seconds at high speed. Decellerate slowly so the nut doesnt loosen. Recheck squish.
You wont believe what you will find. I routinely find .005-.009 differences, so many builds i released at .022 squish were really .016 all along.
I've changed how I do things now because of this. It also explains why the hell my machining would be off for squish, and it drove me nuts.