[scottz]

I would be grateful if my factory spring hangers were only 1/8" out. The first photo shows what mine looked like before, the second is the after photo when I had all of them replaced by a good suspension shop.

No, the X-factors will not straighten your spring hanger, nor would I want to; leave it as is. The X-factors only provide support to the system as is, no correction.
You do not need to shim anything.

Yes, the X-factors will clear the propane line; last photo.

You also have this option, https://www.montanaowners.com/forums...ad.php?t=86536, which I suspect offers support similar to the X-factors; but requires welding. You cannot do both; the hanger braces will not fit if you have X-factors cross members.