I have a 2007 bass cat phelix with a 25 hp 4 stroke merc. Boat is 530 lbs dry, 17 ft long and 42 inches at the waterline. I have a fixed jackplate installed and the cavitation plate is about 2" higher than the bottom of the transom. My current prop is an aluminum black max 9.5p i had a 13 p aluminum prop on before and it was too much the boat would only run about 20mph. With the 9.5 i run about 26 solo and dont hit the rev limiter. Any suggestions?