I wouldn't advise running the motor WOT for very long if it will only achieve 4800 rpm. That is a little low and potentially harmful to the internals on a 2-stroke. (pre-detonation)
I would try a 17p prop if going Mirage or maybe a 19p if smaller in diameter. Your MPH and MPG should increase.
My friend Lawrence installed a 30" Yamaha OX66 on a 25" transom height Parker Cuddy Cabin. That was 5 years ago and it had major movement in the form of transom flex from the very beginning. I think you will be OK for a season or two based on your description.
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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