[Perfectlap]

yeah I think the brake dust bonded to the exposed paint. A few more layers and curing time on the clear coat (did you use the two can Wurth kit?). The texture might have due sanding the primer/filler before it had cured fully leaving a less than smooth finish before the color paint went on. Did you wet sand at all?

definitely DO NOT buy a new set of wheels due to a paint imperfection. I think a body shop I once used removed a nasty dent and repainted the wheel for $65.
The stack of wheels waiting to be repaired could well have kept one guy busy for a month. Buy proper spray gun and this could be a nice side job. Lots of curbed wheels out there.