Given the stacks flop bet seems standaed and highly preferred, not sure on preferred sizing. Even like a 15-20% psb is an ok option on such a dry texture, we do want to charge villain for realizing his equity with weaker hands.
I would just bet the flop small - probably gets checked behind a lot and it's hard for them to fold flop to a small bet. Btw that looks like an amazing game given the hands they showed up with.