Sounds like you’re getting everything dialed in. The only observation I can make on size is that if the previous owner was subsistence feeding (meaning just enough to maintain life), that will significantly stunt their growth. When I got Eli, my adult normal bp, he was 2 years old but wasn’t as large as my current yearlings and very thin and weak. His prior owner didn’t want a 6’ monster snake, so she fed him “lightly” to keep him small. He is now better than three feet long, too wiggly to measure very well, and been with me for 26 years.

As for breathing issues and blisters, I’d let her settle for a bit to calm down (a day or so) then try to gently examine her. You may need a vet visit if it appears she has a respiratory infection and to determine what the blisters may be caused by. A clean environment and correct husbandry can go a long way towards improved health.