I have strung several racquets with my gamma x-2 stringer. I have notice that on the last main on both sides of the racquet lose a significant amount of tension compared to the other mains. I watched a video on how to tie knots to make up for tension lost, but the last main is still loose. I even tried tightening the last string 5lbs higher compared to the rest of the racquet. I believe that the flying clamps. Can anyone help me? Thanks.