It' me again, the OP.
Came back to see if any new info was available. After reading the additional input, I am going to try and set up with no slack on the non pulled cable. Let me make sure I understand some things:
The horn on the servo must be the same length as the rudder contact points are wide.
Maintain as little contact of the cable to the structure.
Please explain what Ackerman is.
Thanks,
Gary