I don't see anywhere on this thread of what wheel we're turning here. Estimated 30 mph (maybe 28-32?) could be more or less. Are we running in still water, or in current.
When I had my 225 ox66 with a 15x19 prop, I was turning about 4700 rpm at 38 mph. I switched to a 15x17 and turned it about 5300. The top end didn't change much, but the engine ran better in my opinion.
I think a tachometer would be helpful here. Just my 2 cents.
btw. I did try a much smaller diameter prop and the boat took off like it was a different boat, it would run in the 40's, but I did not like the ride in seas. The bigger diameter
kept the boat in the water better and gave me a smoother ride.
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