I am not sure what servo that you are using for the rudder, but the problem that I encountered with the rudder servo in the tail was oscillation caused by the huge mass of the rudder and the precision of the digital servo. I would love to move my servo back to the tail, can you suggest anything to stop the oscillation? The servo is an 8611. By the way, it oscillates a little bit with the pull-pull setup, and only on the ground. Any suggestions? I am trying to get the CG back a ways.