The humid hide is a great thing to use and it sounds like you really need it.
Where are you that it is 10%?
Where I am I don't do anything hardly at all for my Ball but my snake room is usually in the 40% zone. I will run a humidifier during dry times but usually I am good with just what I have.
With that I would say saving up and ordering a PVC cage would be on my to do list. That will help you a ton.