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Mike, do you know if your current prop was cupped? It probably wouldn't make a huge difference, but cupping can lower your WOT RPM a little.
If you go to a 15 x 15, your going to lose a little low end tourque and your holeshot will be slower (the prop wont bite as well), but you'll raise RPM and probably top speed at WOT.
I bet if you had just one or two people on board with light fuel and a light load, trimmed up you'd probably be right around 5500 rpm with your current prop. Then again, I'm certainly not an expert on this stuff.
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