Oh and to add one more thing, there is a big difference between humidity and just water all over the place via misting. Like i said above, misting will work here and there to help especially in winter but if you have to mist more than once or twice a week once a day, then you need to evaluate your setup and limit the airflow better.
And another thing, a bad shed doesnt necessarily mean you your humidity is bad. A lot of it has to do with the hydration of the snake which indirectly is from humidity of the environment combined with how much the snake drinks.