I bought a 2275 GFS this year with a Yamaha 250 SHO! Great motor and really likes to run. This weekend I had a decent sized group of friends on board and found out that the motor kept cavitating as soon as I would reach plane, even with the motor all the way down. The motor is mounted to a 20" transom on the bottom hole, so there is really no way to put the motor down any further. Anybody have any ideas on how to keep this from happening?