I went through this after the dealer f'd up a rear axle seal job.
It appeared to me that the adjusters don't loosen....they only tighten.
Mine were too tight, dragged, heated up and warped the drums.
I had to go in(meaning pull off the drums) several times and adjust the brakes looser, and coordinate that with adjusting the parking brake to match.
In the end it was perfect, and has had no more issues for almost 1.5 years now.
Easy, but somewhat time consuming.