Sounds like jimincalif solved that rotor alignment issue with some shims. As I inferred, I know little about disc brakes. Been using rim brakes for over fifty years and they are trivial, (for me), to maintain/adjust. Don't have a clue about disc brakes. In fact, my FCX is in the shop right now getting some front brake work performed upon it. Check with jimincalif to learn more about those shims he mentions.