ever wonder if maybe the ball joint connection is worn? Its a bit of work but taking the assembly out and inspecting it is probibly the best bet. I i think the one that is sitting lower will be the one that is giving you problems not the higher one.
I'm battling that right now.
Turns out my car has been in an accident, because there's a shitload of washers and crap under the four bolts holding the headlight basket in.
Can't get the lines to line up for the life of me.
So I'm trimming the holes on the basket bigger so I can move it around more, and getting longer bolts because I've got like 4 washers stacked and I'm running out of thread.