1996 Fiesta Vee Prop Question

I purchased a 1996 Rinker Fiesta Vee and it had a prop on it with a pitch of 17.  The RPM's were running between 5500 and 6000 at WOT which seemed way to high. And my top speed was 18 knots which seemed way to slow.   When I went to a local prop shop they said to get my RPM's to the recommended 4800 I would need a 21 pitch prop which I purchased.  With the new 21 pitch prop I am now at 4800 RPM's and reach a top speed of 21 knots when I am alone in the boat.  When I add 3 more adults the boat will only run at 15 knots and the RPM's wont go past 3200. I am content at 21 knots at 4800 RPM's, but can only achieve this when I am alone in the boat.   Any suggestions? 


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