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The wheels actually seem to spin fairly freely in my interpretation, so I don't think you have a issue with the master returning or any thing like that. I would remove the wheels and spin the hubs. this will give you much better visibility to the system and may let you narrow down the source of the rub. I The noise sounds a little sharp (my description, so open for interpretation) to me to be normal pad to rotor contact. It sounds metal to metal to me, so I agree look at the backing plate to rotor gap and also if one of the pads lost it's friction material I could see that making that sharp grating sound. I'm guessing not, since they are mounted to the back side of the hub, but if you had the rotors off the car and didn't get the mating surfaces between the rotor and hub completely clean this could account for some warpage of the rotor,
Also, these have floating calipers, so even if the master is fully releasing, the caliper slides need to be in good clean lubricated condition to allow them to freely float to generate the clearance on both sides of the rotor since only one side of the caliper has a piston.
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