I have a 2004 Glastron SX175 (17 ft) powered with a Volvo Penta GL 4.3L IO. I have a standard 14 1/4" x 23 pitch Michigan SS 3 blade prop. The boat will do 58 mph with one or two people, which is excessive for my lake, and the boat tends to be unstable at that speed. I need more power for low to...