Just re powered a 203 Dusky with a E TEC 200HO. It replaced a 175 Ficht. I'm using the same prop that I had on the 175 (SST 14 3/4 X 17 ). I'm turning 5900 RPM's with the engine trimmed up all the way running 48/49 MPH (GPS). My question is what can be done to get a little more top end and stay with in the speck range for the engine of 5600 to 5800.