That's good that it is squatting and having a bowel movement, I was worried the damage had caused a problem where it was leaking all the time.
The skin around the vent and tail is a bit dry, probably from the soakings. I would continue with soaking the vent, it does look like it's healing. After you dry the chick, put something on the vent - do you have coconut oil, vaseline or something similar? Just a little, this will help the poop not stick and soothe the skin.
You are doing a good job. let us know what you find.