Ask other Jeep or rally car owners around locally about who they use for alignments, not all alignment shops are the same.
I am guessing whoever you have been taking it to is not well educated in raised Jeeps or you have possibly some bad parts they have not found.
Look for shops that specialize in Jeep builds also for more help.
At 35,000 my Falken still have about half tread and look as good as can be expected for mostly mountainous road driving.
