I too think there is something wrong with that rear caliper but I will say that if you are still in the process of checking it out and trying stuff out you might be interested in trying this tip that I picked up here on the forum (sorry to whoever posted it first it is a good tip!) =>
Over night / over day when you are not working on the car use a clamp / weight to hold the brake pedal in the down position. Air bubbles will eventually make their way up to the master cylinder. It does make a noticeable difference to the brake pedal feel...
...however if the caliper is letting air into the system...
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