Steve,
I had this happen on both the throttle cable and mixture cable that Van's sold me in their firewall forward kit about 5 years ago. In each case, the cable was perhaps 20 thousandths away from hitting both the high and low stops. I called Vans about it and their answer was to drill another hole in the throttle arm of the carbureator. I thought that that was a stupid answer and never did it. I believe that they had a batch of control cables that were made just a little bit too short. I never changed these cables and my engine operates fine. Idle cut off stops the engine and at full rich the cht's are OK and the fuel burn indicates that the carb is at or very near full rich.
I had a real particular FAA inspector and he told me later that he almost flunked my plane because of the control issues. Ideally the push pull knobs or quadrants should not go all the way to the stops. The stops on the carb should make contact. He told me that if the rest of the plane had not been as good as it was it would have become an issue. He further told me that in all likelyhood the controls will work fine but he still recomended changing them. To this day i have not had any problems.
steve ciha