I repowered this past winter and I am looking for some help dialing in the prop. The boat is a 1985 Starcraft MR220V with a 2018 Yamaha FS115XB, currently it is propped with an Aluminum Yamaha Prop 3x13-5/8"x14". I get about 24-25mph with the motor at 5000-5200 RPM, anything beyond that I lose...