I keep my cali king at 85 in the hot spot and around 76 ambient. You don't need to worry about the humidity too much. I would maybe mist once every other day or so if you are using a light since they eat up humidity. I use a UTH and never mist, they don't need much humidity. I use aspen for the bedding and she seems to be pretty content.

Yes, kings are nippy, my girl still strikes when pulling her out of the cage but she is fine once she is out.