Welcome to Just Answer Dodge my name is Mark.
First make sure the wheel cylinder pistons are free to move and not seized in the cylinder.
Try bleeding the cylinders to see if there is good fluid flow.
Let me know....
They are only "automatic" in that they maintain adjustment after it has been initially set.
So, this is a star wheel adjuster. You need to turn the star wheel so that the shoes are pushed outward. Keep turning it outward until you feel a slight drag when you go to slide the drum on.
If the drum just falls into place too easily, then they need to be adjusted more. If you cant get the drum on or it is very hard, then you need to back off the star wheel a little bit.
This will take a little bit of trial and error so be patient.
You'll need to redo the side that does not stop.........the adjustment is still not good enough by the sounds of it.
Also, if you apply the parking brake.......engine off....... do both sides lock up and the parking brake pedal only travels about half way to the floor.......OR does the parking brake pedal go to the floor.