I have considered the Doel fin for the engine, it is a new 4 stroke (49 hours on it), and it has never been one to jump out of the hole. It runs real nice, and gets good economy as far as I can tell. I put a used stainless prop on it with no change. So far the best it has done is 31 MPH on flat water with just me in it. I'm not after speed, but I would like to get on plane w/o plowing for what feels like forever.
Re-powering up looks expensive...
Bill