Erick, I have the pull-pull on my edge and it works FINE. One thing to consider is centering the servo (subtrim) so that the arm is at more of a ninety degree pull to the horn. What I mean is set it so that it is NOT perpendicular to the fuselage, but at a little bit of an angle. That may work.

I used deflection meters when I set min up and there is NO measurable difference between the halves at any elevator position.