ORIGINAL: AFSalmon
Hey Zippi, what profile are you doing this on? The advice above is solid as it is rare to see pull-pull on profiles these days. You'll only see the pull -pull setup on giant scale full bodied rudder systems like what we do in the big Hybrid Edge. In this case we use a quality setup like Dubro. If installed correctly according to the instrusctions and proper geometry then the system is flawless. Afterall that's what every giant scaler does on the big planes.
It has nothing to do with the setup. If you take a look at the TopCap for example, the servos are in the wing and the pull-pull cables run through the fuse and then to the control surface. The problem is the angle at which they enter and exit the fuse. And to add to that, we use cheap standard servos which are not meant for pull-pull setups as there is too much pressure from the tension.
On giant scale planes there is no angle and therefore this doesnt happen.