Huge difference holding 10 mph surfing, rock solid, never touch the throttle, but now I cant hold 17-19 for wakeboarding. I dumped all my ballast for wakeboarding so I am thinking if I add some next time it will help by putting a bigger load on the prop .I also get some cavitation idleing in gear and reverse around the dock, but its a much bigger prop so i am assuming i have alot of aeration under there at slow speed.