Are you using a glass tank?
I got rid of my glass tanks years ago. They're not designed to hold humidity, and there are much better, cheaper, easier options available. There is no such thing as a "bad shedder" only bad cages and bad husbandry... And medical problems if you want to get technical.
If the snake is healthy, and it consistently has bad sheds, that means there is a problem with the snake's habitat. An ideal enclosure never needs to be misted...ever.