I have a 2003 ProCraft 180 Combo with a Mercury 115 Four Stroke. Current prop is the stock prop, 13.25 x 19p,3b aluminum. I am turning 5600RPM at WOT/43MPH, full trim, full tank of gas, 2 people, with fising gear, running in a light chop. My engines recommended RPM range is 5000 - 6000. The...