I'm trying to figure it out, but the list of parts, like parking brake, seems to suggest the rear. If so, you need to disassemble the entire thing, and look for some evidence of rubbing. I do know the rear parking brake uses an oddly bent retainer pin for the rear shoe to provide clearance for the parking brake lever. If this was installed wrong, it could rub on anything rotating. Also, did you forget to use the washer on the caliper bracket bolt? If it i sticking out too far from the bearing knuckle, it could be rubbing the rotor.
Trust me, if you can hear it, it left evidence. There should be some sign of rubbing on something. A complete teardown again will reveal it.