This is going to be obvious but since they outnumber you good, choosing where to fight is really important.
I killed the Judge at level 3. I had my entire team exit through the hole on the wall. The Judge was the only one who could follow cause the ladder is broken but he had Phoenix Dive. So all my guys ganged up on him. I came back to the hall later when I was level 5 or something to kill the rest. I had everyone sneak into the side room first so they were forced to come at me one by one.
