I have one big Albino female that has a bad shed almost every time, and I also have a few mousers. I feel your pain. I have a big girl that just laid 7 eggs and she won't touch a rat, pre-killed or live. Has to be mice. And I have a Pied girl that is also a mouse only snake. It's tough because usually they won't accept more than one or two mice and that's it so they stay pretty skinny. I try to feed a couple mice more often to get them up to weight but it's a pain. If you can get them on rats you'll do much better but it's not always possible.
Personally I'd switch to Prococo or Reptichip. They come in a big compressed block that expands when you soak them in water. Personally I like the 'Chips' the best (vs. the Coir or Fiber).
https://www.ebay.com/itm/Prococo-Coc...8AAOSwC81asXPo
And here's how to expand a block:
https://www.youtube.com/watch?v=GLwL7xSeKYQ
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