2011 Sea Doo Challenger 215hp - What to pay?

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I took the boat out this morning with 2 of my friends with a combined weight of 580 lbs and with a full fuel load and I was only manage to squeeze out 37 mph at 7,800 rpm. The lake we were in was calm. My question is whether that is normal the boat would only rev up to 7,800 rpm because I thought they were more closer to 8,000 rpm to 8,1000 rpm?

Is the speedo a GPS speedo? If it's using the paddle wheel, I would get a 5 mph to 10 mph variation. So check your speed against your phone gps and get that base lined.

Right now I can do about 40-41 with about four people on board and I have a crap pump.