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Ultramaroon
Reading through some of those posts you linked again.
The bimmerforums one. I absolutely don't believe over-torquing a pressure plate would cause this. It shouldn't be moving axially, only spinning with the flywheel, so I call bullshit on that.
The miata one provides some interesting insight. Not sure why the PP tines/fingers would "give out" at high rpm. They're just flat springs that are spinning. I can't imagine the centripetal force they see would cause them to buckle or weaken at higher rpm.
The nasioc one just details the problem, but I'm glad I'm not the only one having it.