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Phack,
I have the same boat and motor. Sounds like you probably have a 19P prop because mine came with that prop and ran the same speed at that RPM with a 19P. I think you will find that the motor will not reach full WOT RPMs if you go to a 21P. If you do have a 19, that is likely your best speed. That motor just does not have the HP to turn a steeper pitch.
I now run a 17P since WOT is not used much on the West coast.
Codfish
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