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It is not a Yamaha Performance prop since that one is polished stainless steel.

With a WOT of 4500, something is horribly wrong.

Is the hull waterlogged?

What is your load, passengers, fuel, gear? Bottom paint? T-Top?

Mounted 2 or 3 holes uo you can choose between these Whaler owner tested props. Keep in mind the blade designs are all different so that is why there are different sizes.

13x17 Yamaha painted stainless steel
13.25 x 14 Yamaha Performance Series
13x16 Powertech SCD

Note the WOT RPM's is 6300 so hitting 6k at WOT would be ideal. Anticipate 36-39 mph.