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To my untrained eye it looks like the upper rear arm is being compressed as weight on the rear increases. Basically the lower balljoint is the fulcrum and the top of the wheel pushes inward. Are the mounting points for the uppers and lowers the same distance apart at the frame and wheel ends? If so maybe some connecting rods with heims midway up the arms spanning from the uppers to lowers would help keep the uppers straight.