My understanding is that your boat is a displacement hull, not a planning hull. As a result, you have too much horsepower and too course a propeller. If you want to use that motor, a very flat pitched propeller will work much better. Flatter pitch means a lower pitch number. A pitch of 10" would be half the pitch if 20".
From what I've read on the internet, 10 horsepower would be enough to push it nicely. Over 20 horsepower is probably of little gain.
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
by The Pointer Sisters