If your doing 60 MPH a rooster tail is a good thing...
Is it a prop rooster tail or a transducer or other device hanging on the
back causing the tail ??? Even placement of trim tabs can cause this.
Take a few rear end pics and post them, we might be able to pick
up on whats going on...
Standard on a non bracket transom is an inch above or below the
cavitation plate.. just my 2¢ worth!