I have a 1977 Bonito, 17, bow rider, deep V, 73 135 HP Evinrude. I realize thats crankshaft horsepower. I always hear of these boats going 45 and 50 MPH. I run 36 MPH at 5300 RPM with two people and 12 gallons of gas. The motor seems to run good, no misses or anything and I tried different...