I have a 70's 13ft Livingston, the top of the transom is not straight across. It has a notch in it to make the motor sit lower on the transom. My issue is I have a Long shaft Johnson 20hp on it. At wide open throttle I get water coming over the top of the transom right next to the motor mount. I would say it let in approx 1/2 gallon in 5-10 minutes of running. Anyone else experience this and know of a fix? I can post pictures of the motor on the transom.