If the problem existed before you installed the poly bushings, make sure you check your motor/trans mounts like I mentioned before.
Did the problem start after you installed any new parts? Wheels? mounts? turbo? etc?
I'm betting it still has something to do with your lower control arms. If all else fails, take it to a reputable shop and see and they can find something. You can also pick up a set of new control arms off Ebay with bushings and ball joints for about $180 shipped.
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