Unusual to use a 1.5:1 gear on such a boat. Double check that. I would expect 2:1 ranging up to 3:1. Should be a tag on the gear giving ratio. Can also check it with a phototach.
And read your survey. Should be some discussion of prop. Not all props are stamped with visible numbers, in that case the numbers will not be in the report.
Some surveys have photos of the prop, post them if you have them.
Not really enough info posted so far to do much analysis.
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