I've got a 28 foot Bayliner that had the Volvo Penta 350 with a 290 DuoProp. I recently had to repower it and took the Volvo Penta 5.7Gi engine and DP-SM outdrive (1.95 gear ratio) out of a 20 foot cabin cruiser. The new setup came with D7 props, but I can't get the boat to go above 3000...