2005 SRT - Issue Steering wheel wobble/vibration starts at 40mph not under braking not felt through car, only steering wheel . Car has 135,000 on it.

Items checked or completed:
- wheels balanced 3 different times at two different shops
- Wheels road force done 2 rims at 3lbs of force the other two at 12lbs
- Alignment done (there is a question I have on this)
- Two tires are new due to flat or bent rim (Conti DWS)
- Rims are not stock but are .5" wider and run stock tire sizes
- Replaced upper control arm on driver side due to play
- replaced brake pads and rotors (cut original rotors and replaced them with no change)
- replaced wheel bearings
- air pressure checked
- tierod assemble changed and steering shock changed
- new hub centric rings
- motor mount and trans mount changed out 12,000 miles ago

The issue will come and go with some cases no issues will appear at first so it suggests to me that something is not staying put and is moving. I checked for play in the lower control arms and there is a little play but it is equal on all four bushings.

The car was aligned using a Hunter alignment machine, however upon some research the specs are different than is what is in the Crossfire service manual, not drastic but it would appear that the toe measurements are not the same, in fact their book shows two different front toe specs one for 04-06 and another for 04-08. Only other spec differeince in their book between the two relates to tread width which is slightly narrower on the 04-08 line.

When we began the first alignment with a toe number of .33 per the machine the issue was still there, pulling it in a bit more to .25 reduced the issue a bit more. Camber and castor are within spec.

The thing is there are some times when this issue is completely gone for say 10 miles and then will suddenly appear again.

Tech and I checked the steering and everything is tight and to spec, no ball joint wobble/play can be felt or seen.

Any ideas where to look?