Sounds like you need a 15 or 16 pitch prop to get you up to 5800. 5500 WOT is minumum if you want decent economy and acceleration out of it. As for your temp issue, sounds like you need to check the water diverter valve on the throttle linkage. Somebody may have installed the valve 180 out and it's letting it run cool at idle, and hot when loaded. The temp should be running around 120-140 at high RPM's, and 160-170 at idle-3000. It isn't meant to be able to go in 180 out, but it is possible. If this happened, it would do EXACTLY what you describe. And your hot horn should have been blowing your eardrums out at 180 engine temp. It should go off at 175.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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