I've got a 18' maxum br with a 4.3 v6 2bbl and a alpha one outdrive. I now have a 13.75 21p quicksilver ss prop. Top speed is 52 mph (gps) holeshot is so so. I want more holeshot and to stay on plane at a slower speed. I'm willing to give up 8-10 mph. I'm in the process of getting my tach fixed...