See anyone can help me out with this. I have a 2001 Glastron GS249 (25') with a Volvo SX outdrive with a 5.7 GS motor with a carb. I can't get it above 4000 RPM. Verified it is correct reading. Boat runs fine, no bogging down, hesitation, misses. Had a 14 X 17P aluminum prop. Went to a 17P S/S...