Yeah, pretty much.
I was clearing up and found the broken X1's so time to do some tinkering. Sure enough, one driver started failing after an hour or so it's trash at this point... time for something drastic. I opened them up and nothing looks wrong so I just added some coating to the diaphragm, just a tiny bit. It's been an hour now and they sound pretty much balanced so this might have worked but it adds another issue, are Stax having coating issues 65 years in?
Another thing about the X1, the drivers are wired out of phase as in the + signal goes to the back stator. Might be worth adding a cheater plug to these to reverse the phase to try out and the earpads on the X1 are clearly made by the same company as the 007S pads.