OK first off screw that darn servo down otherwise all you're doing is twisting your knickers and every thing you are doing is inconclusive. Now return to the second paragraph in my post above #3 Your pushrods need to be in the closest hole to the screw on the servos output arm. Using the hole furthest out on the elevator which goes to those double pushrods which are really to close to the servo will never work and bind every time. You are demanding far to much travel of the servo and pushrod.

Now if the rudder truly goes further one way than the other with no pushrod connected the reason is very simple: here is what happened.. Who ever assembled and Ca'd the rudder pushed the rudder to tight aginst the fin period. The fix is real simple and a no brainer, stop amping about it. You really do not have a problem and you really do not need two and half inchs throw, this airplane is never going to be a 3d airplane.

John