When you increase flow with things like cams and head work you will flow more air at lower boost numbers. 33psi looks cool on paper, but boost numbers really don't mean anything. It's the airflow that matters. This is nothing against
@VoodooJef 's build or anything. He's making good power for a lot of miles now, but don't get hung up on boost numbers. If I were you I probably wouldn't even mess with regrinds. I ended up wasting a couple hundred bucks before just going with the CS cams.
Ethanol is wonderful and you should run a blend if it's available near you.