I have a 20' runabout with a 5.0L V8 engine. Manufacturer's shop manual says WOT should be 4000-4400 RPM. I am currently running a 14-1/2 x 19 prop, WOT is 4200, and top speed is 40 MPH. So everything looks good on those numbers as far as I can tell. Had it out on the water with the wife and...