Originally Posted by travelover
Your problem is not wheel balance, it is rotor thickness variation often miscalled rotor warpage. You will need to have the rotors replaced or remachined.
Follow up... my car is back in the shop. Yes, the problem definitely was the brake rotors.
Both the front and rear brakes need work done. Calipers, brake pads, etc. etc. etc.
Oh well, now I know for next time when the twist happens
..must be the rotors.