Rescue situation, newer keeper

[Bogertophis]

Vetericyn brand water-based ointment for reptile use is an option- available in some pet stores & online- for any wound care. (Better for snake skin than petroleum-jelly based Neosporin.) I was also thinking his back looks like it could be a burn- how was his former enclosure heated? If its a burn, use that "silver sulfadiazine" cream (aka "Silvadene")- that's the best thing for healing burns.

Hopefully the "wobble" is genetic in origin & not a symptom of illness. In case you need to find a vet: https://arav.site-ym.com/search/custom.asp?id=3661

As you probably know, the mites can kill this or any snake- keep on those until you're sure they're gone. Besides that, they're thought to carry diseases.

The soaks to help get rid of mites should help with his hydration too, but if old eye-caps don't remove easily after a while, get vet help- eyes are delicate, it's hard to see what's really going on, & well-meaning people have accidentally blinded their snakes with aggressive eye-cap removal. That's not the most important thing to work on first anyway- getting rid of mites, & taking care of any injuries or infections, along with overall hydration & getting him to eat will help his overall health including his eye-caps.