@mopowers I would use the 0.039’’ gasket option. - I’m using this gasket.
If you’re still concerned about the compression with your available fuel, you could smooth & polish the combustion chambers. This will increase the chamber volume by a few cc’s (around 4-5cc) and get rid of any sharp spots, casting texture etc. Also will drop the SCR down a little as a result.
Heads are Trick flow, so they're already smooth as hell. I'd be a little hesitant to touch a carbide or tootsie roll to them. If I attempted to remove 5cc's from them, it wouldn't be pretty. haha!