Toasted my ceramic discs
#16
Also, many will recommend that the rear pads be checked very frequently, as pads that are worn just 50% will tend to wear the rotors faster than new pads. If your pads were very worn before your track days, you may have added additional wear to the rear discs.
But again, I would recommend a formal brake inspection before spending $$$ replacing the PCCBs with aftermarket steel rotors or other. I do not believe that the "wear circles" alone are a reason to replace the rotors.
bob