Rear caliper questions

Victim- 05 Golf

Brakes were hanging up. Removed rotor, replaced pads and rotors, lubed and reassembled. Properly screwed in piston first. Made sure to skin back boot and lube piston.
Hand brake would not set. Removed console and checked cables which moved freely. Tried adjusting but could not get handbrake to set. Cables are free in their sheaths. ?*?*

Made sure lever at rear calipers were operating properly with car up and used large flat tip screwdriver to move lever while rotating wheel by hand. Seemed to work. ?*?*
Somehow doing this caused the master cylinder to go bad. ?*?*

Replaced MC, bled system 3 times, cycled through VAGCOM.

Brakes still drag slightly and cannot get handbrake adjusted.

FYI - I lubed between caliper brake lever and exercised it by hand to insure it moved freely.

Any suggestions?

So doing the same test as the big screwdriver test except with everything connected, the e-brake does not engage? Wore out calipers?
Anecdotal- My daughter just did her back brakes, they were dragging, turned out parts guy gave her the wrong rotors.