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There are several factors that determine top performance

Engine mounting height
prop style, material and size
Smooth hull.
Weight of gear, load in the boat.

For the motor in question, you want wide open throttle (WOT) to be 5200-5400 rpm's.

Without knowing what the existing prop is, load in boat etc., you are over propped.

You need to pull the prop off and look on the inside of the hub for the part #. This will tell you make/model and pitch.

Prop sizes and performance is NOT universal across brands and materials.

Selecting the correct prop is a bit of science so don't just run out and buy a 17" pitch of whatever.