I'm having a bit of a time sorting this one out. Like the title says, I have low RPMs at WOT. Engine is a 383 stroker making about 340hp in a Bayliner 2455 weighing about 3900lbs (counting 30 gallons of fuel, water, pax and "stuff"). RPMs are: 4200 with 18 pitch prop (4 blade), 4300 with 15...