I may have messed up here.....

Rather than use what you have for a deck height as measured, just calculate off the 10.720 blueprint height and have the builder square deck it to there.
IMO you have the wrong pistons. Source a set that has a big dish, then set the quench at less than .040 via the gasket choice. There's no reason you have to have a static anywhere over 9.5:1 for this build. Build it to run on your low grade - you'll enjoy the final product more and not have to dick with the tune to make it work.