You may be right.
Maybe try a different tach and compare numbers. If it aint broke dont fix it! My book shows 19 degrees BTDC max advance and you want the throttle butterfly
How big is your boat and how much weight is in it? Without previous WOT rpm numbers all you can do is cross the T`s and dot the I`s. It is possible your
I should also add that from dead stop to wide open boat gets up and goes. Planes out pretty quick and seems to run smooth. Like I said it may have always
Haven't checked the timing on it. Hull and prop are clean. Decarbed it. Throttle butterfly is fully open.