How is the "Hole Shot" on this boat? From what I read in the posts, it appears to me to be over propped and may also be a tach issue. This boat is a 28 footer at 7500 pounds with a single 5.0 pushing a 1.95 out drive with D4 props, Would expect D1 or D2s on this. 35 mph isn't bad for a boat of this size and weight on a single 5.0. If it's able to get up on plane and doesn't struggle, I would look at the back of your tach and see that it's set for a V-8. There's an adjustment screw to set for a 4 cyl, 6 cyl, then 8. Won't read correctly if it's not right. D4 to me is big prop for that boat and the 1.95 outdrive. Would seem more likely on the 2.30 DPS.