I just got a 24'4" Vindicator, it has a 7.4 L mercruiser with a Bravo 1 outdrive. It has a SS 21 pitch Mirage prop. at WOT I am running 4600-4800 rpm, at about 50 MPH according to the gps. what kinda prop should I look into to to increase speed to the 57-62 range. I have no problem at all...