Like I said, there is no brake fade, just longer travel.
i looked at the pistons and they move freely, they are clean. I cannot see and issue with the system, it works similarly to a AP or Brembo or Girling setup from a caliper system point of view.
the only thing different is the pads back spring.
Why did sram put that there? The spring keep pushing back the pad backing plate again the caliper housing. Basically, for those you have replace pads on cars, the spring is doing what you would do to push back the piston is the housing before fitting new pads.
self adjusting should/would work if there was nothing constantly backing the pads back