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When you run WOT @ 6000rpm, what kind of weight--including fuel load is in the boat? Boat manufacturers will and do "prop" boats so that when loaded up with people, gear, and fuel so that it will run close to the recommended rpm at WOT. So, you might have the right prop for what the expected use of the boat was built for. But if you run with no fishing gear, an empty live well and 1/4 tank of fuel, and it's just you on board, I could understand that you're running too high of rpm. Try a different prop. You'll get a better hole shot, and you'll run rpm in the right range.
 

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Like Bill said, go up in pitch to a 15X19. You're not always going to run with 4 peeps. Also, in the fall and spring when there's cool, dry dense air your motor will make more HP and thus turn more rpm than in the middle of summer.

You might be able to borrow one from the dealer and try it out before you settle on the one that you want.
 

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I just had another thought. Has that prop ever been in for repair/refurbishment? If so, it's common to fix small dings by grinding down the prop. This means the overall diameter will decrease, which will allow the motor turn higher RPM. It's an old trick that racers use to get more RPM. Measure it and see.
 
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