Continue to mist until it reaches 70-75 try misting the sides also,
when my ball is in shed I do this:
- Put Luke warm water in the mist bottle (seems to keep the humidity up for longer)
- Luke warm damp towel covering half of the tank
and that is it and he has perfect sheds.
or you can even add a spare water bowel and put it on top of the substrate where the hot spot is.