Agree with most of your points, although I would point out the top 8 lightning parses there are using the chain lightning exploit.
My own idea would be to make disintegrating tier 4 gear give you unassembled components. 1 UC for 244, 3 UC for 246, 10 UC (or maybe more since they're so rare) for 248 or something. Small enough that you'd still have to do content, but enough so that it wouldn't be worthless.