The lower the pitch, the higher your WOT RPMs will be. Just be sure that at wide open you are hitting the minimum top RPM for your engine. Any dealer selling props should be able to advise you on what works for your HP and boat weight.
I have the same boat. The vacu-flush instructions and manual were taped in a plastic bag wrapped around the water feed line behind the head. I only noticed it after a few weeks. Take a look there.
