My partner and I ski alot on wakeboards. Average speed,, 20 mph. The throttle is about 1/3 open. RPM is about 2100 I know that this is not full load . Specially at 1/3 throttle. Boat mechanics say boat either idle or are at full load. They haven't skiied with me. I was able to lighten up the Mech. springs, and the engine is cooler, pops up with less throttle , and is getting better gas mileage. I do much timing test while boat is under load to be safe. Anyone out there put vacuume advance on a boat? I'm open to ideas. Got to save the buck. Boat is an inboard 350 sbc . Standard 260 hp.