By all means try the other prop. Something is definately off with 30% prop slip. That is HUGE for prop slippage at 5100 RPM's. The stilleto I have is a good biting prop that actually has very low prop slippage, and good top end kick. Definately try another prop though, something just doesn't sound right with yours, and you never know if they used the wrong prop block when they redid yours, and messed up the rake when they reworked it. Adding cup would bring your prop slip way down, but it normally costs you top end speed, and you're already turning way to low at WOT(should be seeing 5400-5800 RPM's on that engine to keep it happy, and live a long life).
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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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