I have a 1999 Volvo SX 4.3L stern drive. I have a 14.75 x 21 pitch 3 blade prop. My Rpms are too high. Rated for 4600 but running at 5000 WOT. SPEED IS GREAT. Dont pull skiers but I need to bring my RPMs down. Should I just control with throttle or do i need to change the prop. Its pretty new SS...