I have the 2.0 model sea drive and i hit 55 mph w/ 225hp via GPS in 1-2 foot seas. Its gotta be the prop. go to the prop shop and get a new higher p prop or buy my seadrive and motor and slap it on there and hold on, ill take 1500.00 for the whole drive and motor and its already off the boat, i had a bad transom. Jason 1-757-724-8686