NCJeff,
I don't have that steering issue with mine. I had an alignment with my 35s and Js - and I don't know if that has any carry over effect onto these with the Slee 6 and XMLs.
I can easily drive with 1 hand with my truck. If I let the steering wheel go (no hands) it will drift to the left, but its not fighting me while Im driving at all.
The change to the big tires makes more road noise - but the Slee 6" springs is a much softer, less jarring ride over bumps of any kind.
Can you record a short video or have someone record one of you driving and the steering wheel to show what issues you're having?
NCJeff, aren't you getting control arms later? If you haven't fixed caster at all on those 6" springs you are way negative and it's going to wander to say the least. That's lift, not tires, although I wouldn't expect great things out of a tire like that for road manners.