I just watched/listened to the videos. I'd agree that is sounds like a faint rubbing on the brakes. This might sound odd, but how often do you spray the brake dust out of the brakes? I noticed my brakes really like to squeak if I don't spray some water in there once a week or so.
One other thing worth checking is the bolts on the brake calipers and double checking your lug nuts are torqued down all the way.
Good luck on hunting down the cause.
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