Add this .
http://www.amazon.com/Zoo-Med-HygroT...s=repti+fogger
It has a sensor for both heat and humidity. You can set the level you wish the humidity to stay and it will turn the fogger on and off as needed.
Your humidity is fine during non shed at 40-50. Shed times 50-60 should work fine.
You can also use Herpstats that have this same ability (the 1, 2, and 4 will, not the intro or basic) but they are gonna be more money. This may be an option if you could use a better tstat too. Then a Herpstat can handle all your needs.
http://www.spyderrobotics.com/home/products.html
The HygroTherm should be available at both big box pet stores.