On my Giant Sudokhoi, I've got two hitec 605 servos on a dual pull-pull elevator. The servos seem to be moving in an almost identical rhythm.. the movement seems fine. The problem is that I've got quite a bit of tension on the pull-pull lines and the 'return to center' isn't exact... If I have less tension in the lines, will that alleviate the problem? I can see the surface sticking especially on landing when the plane is porpoising on the approach... the elevator sticks just a bit up as a I dial in up and vica versa.

Any suggestions? Does this make any sense?

Thanks,
Juhan