It is doing exactly what it is supposed to do! The extension and retraction range of the rod never change no matter how you turn it. The adjustment is done by screwing the rod end in or out with the actuator rod at full extension. The total range of motion of the stabilizer never changes; By adjusting the rod end you just set the point at which it stops at the upper end. The lower end stop will continue to be the same total distance from the upper end stop.

As an FYI, on my SS7 after flying it for a while I decided that the 7/16 factory recommended adjustment was not to my liking. I wanted more nose up trim (for use with full flaps). So I adjusted the rod end so my total range was moved down (nose up) to where the bottom end point was at the bottom of the slots in the tail access covers.