I have a 1987 rinker v180 with a 3.0 L 4 cyl it is 17'6" and weighs 1900 dry plus 20 gal gas 4 adults. I have never had it in the water yet, but some have told me to get a 4 blade prop for it. When I got the boat it came with a 3 blade prop. Can anyone tell me what the advantage of a 4 blade...