I buddy has just bought a nitro 700 with A 90 merc. He want to know which prop would be the best. The boat came with a 23p alum. and it will run 48 mph(GPS) at 5400rpm, with a 20p power tech ss it will only do 44mph with 5200 rpm, and with a laser 2 24p it will do 45 with 5100rpm. Why is the alum prop performing better and any suggestions on a prop or jackplate will be greatly appreciatted.