Are you sure? Any slop in the servo gears produces the same angle of rotation of the servo arm regardless of the linkage, so a control rod attached at a small radius will have a small linear movement compared to one attached at a large radius. Then at the control surface, the small movement of the pushrod attached at a large radius will have make small angular changes in the control surface. Surely a linkage that is attached at a large radius on the servo and a small radius on the control surface, such as for 3D travels, amplifies servo slop?
Harry