The other thing that it might be, is a low caster causing a steering wobble. I had this with the 2" OME installed, when I hit either a pothole while cornering, or an angled bump in the road.
In my case, it was not DW and was fixed with a set of AEV drop brackets.
This may, of course, not be what you are getting, but you didn't mention any caster correction, so it might be a possibility, particularly as you have already torqued the major suspects.
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