On my used Basstracker 16' w/25hp Johnson I noticed the motor seemed to be mounted to low for when under full power a lot of water sprayed around the transom area. Measured and found the (what I think is called) the cavitation plate or fin on the engine was 2 1/2" below the bottom of the hull. My Son who I trust 100% told me that that fin on the engine should be even with the bottom of the hull meaning I would have to raise the engine 2.5inches. Is this information correct?