I have a 1994 Stratos Pro XL with a 1998 Evinrude Vindicator 200 on the back. The motor runs nice, sounds great, but won't reach max speed. I know this boat should be able to max out at least in the low 60s and I am only hitting 40 right now. My WOT rpms top out at 4500 which seems low to me. Wondering if this is a prop issue or something else? Has a 13 1/2 25p Renegade four blade prop. Any ideas? Thanks.