they shed when they need to. what size prey are you offering, and how much does the snake weigh? you might be unintentionally underfeeding.
also some humidity tips: sphagnum moss! or, something i do, is get a hand towel, soak it and wring it out so it's not dripping, and lay it over one of the hides. towel method can last about a week before it needs to be rewet.
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