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2014 SF20 70HP Yamaha Top Speed

Well I couldn't find my login and just got it figured out. Sorry I didn't get back in sooner to reply. I really appreciate all the replies. With the original 14 x 11 prop I over revved past 6300 at WOT. I spoke with the parts department at my dealership. They recommended a Yamaha 13 5/8 X 13 prop. Now it is 5100 RPM at WOT. That seems like it is too much prop to me. It did pick up MPH to 19 with this prop. Moving in the right direction. Seems like I may need a 12 pitch prop but cannot seem to find one. They only seem to come in 11 or 13 pitch. Any suggestions that would put me at 6000 RPM at WOT. All of these are with 3 persons at about 600 lbs. May be time to hit the gym... 
 
There are other props.... It's not just about pitch...

But if those were my only two choices, I'd go back to the first one and just don't over rev it.
 
2013 SLM20, 25" tubes, Yamaha 4stroke 50, restrictor plate removed, approximately 10 gallons fuel(60lbs) 18 MPH @ 5,700 RPS per Lowrance GPS with clean tubes and two aboard. Yamaha 14" 11p.

....interesting note: Yamaha 50 weighs 237, 60/237, 70/260, 90/380, 115/377, 150 tips the scale at 480. Horsepower to weight ratio is surely a factor. 17 mph out of your 70 does certainly seem low to me.
 
I assume you've played with the trim? My speed can easily very by 3 mph just by over and under trimming.
 
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