Self adjusters keep overtighten

Yes, left and right are different but if you didn't mix them up there's another problem. Is it a manual transmission car and that's why you use the e brake? Sounds like a cable binding up. You can remove the drums and have someone energize the e brake and then release it while you watch the action. If the seized side doesn't return you have a bad cable. Spraying the sheath of the cable and working the lever can sometimes loosen the rust inside and free the core.