If you look at the A arm on the left, it appears to be oriented differently 'tilted backwards', from the one on the right. I think this could be your issue.
If you think about it, the shock can rotate right to left to some degree by the way it mounts on the bottom, but is limited in movement from front to back.
Check the angle of A arms in regard to each other.
Frank
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Poncho Huggen, Gear Snatchen, Posi Piro.
