I'm no expert, but I've read up on shedding quite a bit due to my new-found obsession with the titular pet. Are you using an analog hygrometer? If so, they are fairly inaccurate. I've heard of people comparing with digital and seeing a 20-30% variance (on the humidity percentages) in accuracy.

If that's what you're using, as I am, flaky shedding caused by low humidity is normal. Always doubt your analog.