I don't know your vehicle intimately, so I will muse in general terms.

If the bearing is checked and found to be OK (which I think it is, because of the reported wear on pads), the problem is obviously that something is causing the caliper to "work".

Slack off the handbrake completely, to eliminate that option.

If that is not it, it has to lie with ABS (if fitted), or the pressure distributing valve(s). Maybe the pressure is apportioned incorrectly, with the one caliper getting more pressure than the other. This is obvious when it happens to front brakes, but not so for rear brakes.

(If I am off-line, very knowledgeable members will soon tell you, but I thought throwing ideas into the stew might just trigger something)