A picture would help....if your lip is too far away from the line tie, that can cause the problem.
Placing the line tie right on the lip gives you the widest action. As you raise the line-tie's position away from the lip, the action will tighten, and the higher you go, the tighter it gets. If you raise it too high, though, you'll drop the action completely.
Very small movements of the line-tie position have a large effect on the action.