I have a 1997 Larson 23 foot deck boat.It has a Merc Cruiser 5.7.Top speed with the current prop is 38.5 mph,measured by gps.The prop on the boat is a 14 X 23 BLACK DIAMOND aluminum.The boat will carry about 4 adults and 4 teenagers.We will be pulling a tube with 3 people on it, knee boarding,and wake boarding.My top speed was with 4 adults.It is slow out of the hole so I would like to approve that but hate to lose my top speed because of it being so low.At its top speed Rpm was about 4600 RPM.What do you guys recommend?I don't mind spending some coin for some noticeable improvements.