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I'm surprised that your RPM didn't increase but not surprised that your speed dropped by reducing the pitch by 2". Have you tried a smaller diameter? I run a 13.25X17 on my 130HP pushing my 190 Bay, but normally don't get much above 40 mph and 5500 rpm. I've not gone up in diam or pitch as slow trolling is more important for me than getting to the next spot in 10 seconds.
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