rkarran I would say too much prop. I run an old style sst 15 x 15 most of the time on my 18 with a 150 about like yours. 39 - 41mph @ 5400 trimmed with a heavy load. Planes very easy and runs well when it gets a little rough.
Sounds like your motor is well tuned. You ever check compression? Mine is 103 - 106 with about 300 hours.
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