Mike I was looking at your pics & I think I saw something, but not sure. It looks like the lining on the front shoe on the passenger side of your car might be getting thin on the inside edge. I had this problem years ago when I was in auto shop & I showed it to my instructor & he had no idea what would cause it. I finally figured out that it was because the springs that hold the shoes in place against the backing plates were weak & letting the shoes flop away from the plate. This might be happening on your car. I'd recommend replacing them with the later "nail & washer" type setup. It's a better design.