I have the same prop for a spare that I had general knock down 2". If you want to give it a try I'll be glad to let you use it.
5400 is pretty low on the top end loaded. If you are seeing the tach surge in seas you are likely over propped. These motors like the higher rpm range and I was advised by my favorite tech that lugging these motors is not whats best for them. Speed on a empty boat is cool but holding tough in seas with a full load is what I prop for. The right prop for my set up is 16x20x3.
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[b]The Moose is Loose !
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