Originally Posted by Hugh Jardon
fuel filters can affect fuel flow which would give top end performance issues
i would say that you probably need to try a 19 prop on that combination as the cobras are quite heavy, it would give you even more acceleration but may allow you to get further up the rev range
I would have to question the fuel filter remark unless it's clogged up, and the Opti technology would definitely get the hump if it couldn't get enough fuel and tell you so! The Smartcraft instruments will tell you if you have a specific problem (that it is aware of!).
Water in the fuel and Opti injectors don't mix at all well, a 5 year old Opti might have injector issues which would cause all of the above symptoms. I think that it would have to be very heavy to need a 19" prop.
My guess would be setup - move some weight towards the back of the boat (do you have a big anchor?), and measure the height difference between the cavitation plate and the keel - raising the engine always helps speed .......... up to a point!