Sounds like the bracket may be bent up a little. My pontoons bracket had been hung on stumps before and had bent it up a quarter inch. I moved it back down and held the bracket with the transducer on it to the bracket till I reached just below the log (pontoon) and marked and redrilled holes. You don't need it way below the pontoon because it will cause rooster tailing. When the boat is in the water the transducer will be plenty far enough in the water. Just remember where it's at and don't get yourself in a position to snap off the transducer like a few of us have done. Good luck. Ferdi aka Fred PS Don't run out and buy a jackplate to move your motor back if you get a Side Imaging model Sonar. I did and found out after I recieverd it and mounted the transducer a couple months later that I could trim the motor enough to read the bottom good at lower speeds and I don't need the 12" jackplate.... Ferdi aka Fred