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Now I see what is going on. You are WAY over tightening the brace and risking frame damage!!!!

Loosen both sides of the brace completely. On one side slowly turn the screw until you can feel that the top arm isn't loose and the top frame isn't moving when giving it light pushes in x-axis. Do the same on the other side.

Very LITTLE support force is needed for the braces to function properly so be careful how much you turn the screws!