to check your wheel bearings, lift the front end up, grab the top of your wheels, and shake. if your wheels move, your bearings or ball joints are garbage.
bad ujoints can cause death wobble.
if your steering isn't aligned that can cause death wobble.
if your control arm bushings are bad, that could cause death wobble.
how much lift do you have in front? using what components?...you say spacers, but what height are they, and what height are the springs?
remember, drop pitman arms ONLY work directly in conjunction with track bar drop brackets of the same quantity of drop...if you're changing your steering, you must change your trackbar angles to match...and vice-versa.
your track bar does not seem to be the issue.