Hi. I have a 2003 521vx with a evinrude ficht 250 on it. Has a Ranger 6 inch hydraulic jackplate. Prop is a 4 blade renegade says 13 1/2 X 25 inside. With full tanks of gas, 2 people, tournament load of gear, jackplate all the way down, I was lucky to touch 53 mph on gps, rpm's in the 5,000-5,500 range. That seems way too low of speed. Can something this slow be just a prop issue? I just got the boat last year, and only had it out a few times. Always ran with full tanks of fuel, but alone I was still around 56 mph. Still too slow of course. Hole shot is great on it. Only thing extra in back is 1 PowerPole. Any help would be appreciated. Thanks