Mike,
It sucks to hear you having problems again . For what it's worth, my rear suspension is setup similar to yours. Stock isolator up top, 200lb. 8" spring, strut sectioned 1.5"... and going off the pictures taken, the theaded tube is to low. I actually had my threaded tube so high on the strut, I had to cut off 3/16" of it (otherwise I couldn't tighten down the gland nut), so it was flush with the strut housing when the gland nut was off.
What you could do that wasn't recomended yet, is buy longer threaded tubes and cut them to length, then you simply remove the old threaded tubes and put on new longer ones. This way, there is no welding involved and you have a lot of adjustability. You can then sell your old threaded tubes to possibly break even on the cost of the new threaded tubes. Do you understand?
!M!