Prop for All around Speed and Towing 91' Johnson 120 V4

[captain_strikes]

Currently shopping around for a great prop for my Johnson 120. It currently has the stock prop on, I am not 100% on what the pitch is but based on research I assume it's 14x17. It sits on my 1991 Kingfisher xl-179 fish & ski boat. I currently get around 35-40mph at 5500 RPMs after trimming out. (3 batteries, full tank of gas 30 gallons, 2 adults, 30lbs fishing gear, cooler, troller motor)

I would love to get to 50mph. Engine is running excellent and sounds great.