RE: *Pull Pull System On Profile*
Start with the servo. does it go back to the center every time? If so, then you have some slop in the pull-pull connection. The pull-pull cables should be slightly tight, but not like a guitar string. How many degrees different from up-center to down-center? If it is only a few degrees than I'd just fly it. In the air, the air loads will help to center the surface.