Its more like its not in balance and most of the thrust is directed down causing the bow to rise till you get on the plane, at which point there is a change in forces acting on the hull countering the thrust direction of the prop. On your barge, the prop thrust is in line with the center of gravity, all the thrust is horizontal with minimal vertical force. On mine, a significant proportion of the thrust is directed down on take off as the motor is obviously pointing below the center of gravity. The trim has minimal effect on holeshot because the motor is way too low. Once on the plane, i can trim out to a degree but i can feel its not quite doing as i ask/comand when i trim in. As i said, a finely balanced sea saw is the ideal.