Your slip most likely is in the 16% range.
First, different propeller pitches in the same family with same geometry have natural efficiancy changes. Did that come out clearly? Sometimes I don't write exactly what I'm thinking. (However, this pitch, 30 B1, should run very efficiant.)
Secondly and most important, boat hulls change their running attitude as speeds increase. It is easy to understand this if you concider the wetted surface area of your boat at 40mph vs. 70mph. As the boat lifts, so does the propeller. As the prop reaches the surface, many things can happen. Ability to hold the bow can lessin, induction of surface air can be enhanced. The personality of each different propeller is shown at WOT (those are important words) ((don't tell any one)).
So, leave well enough alone, you are going faster. Slip % can be over rated. If it takes more slip to go fast, slip away!(this is a whole other thread). Test with 1/2" spacer. Try multi blade props.
If you want to talk about this more, don't hesitate to give me a call. Anytime.
As my New Zealand friends say,
Cheers.
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