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| To me, it sounds like you might be over-pitched. Even if you move your motor up a couple of holes, I would doubt you would see an increase in 500 RPM.
The best thing you can do is call around to some dealers and find out who will let you run some demo props. Try a few different brands, but I would start with a 15 pitch prop. When you find the right one, your boat will handle well, you will get good lift with a higher rake prop and if the prop is cupped it will bite the water better.
Once you have the best prop, then start playing with motor height. Given that motors have a choice of bolt holes, I would start with the third hole up. If you get excessive cavitation on all trim levels, come down one hole, and repeat the process. Once you get to a point that you can make moderate turns without "blowing out" you will be set with the correct motor height.
I happen to run an aluminum prop on my rig (it's only 50 hp so steel really was out of the question due to lack of choice) called the SOLAS Alcup 3. It has a larger exhaust hub so there is less restriction, which will help to increase HP. The blades are also progressive pitch and cupped throughout to give good handling and excellent hole shot. With this prop, I was able to go up to the third bolt hole off the transom...and might be able to go a 4th...but have yet to try it. I can now turn well without slipping and actually gained about 2 MPH over my stock 17. this is a prop you may be able to stay with the same pitch.
Good luck with the changes...it's a fun job, but can be tedious.
Steve | |
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