Young BP's that are growing rapidly tend to shed every 4-6 weeks. Adult BP's only shed a few times a year.
There are a few things you can do to increase the humidity, first off ditch the hydroball, they aren't helping you at all, and are just a mold risk at this point.
I would suggest switching substrates as aspen doesn't do much for humidity. Eco-Earth, repti-bark, cypress mulch, or forrest floor are all much better choices.
Cover 70% of the screen top with aluminum foil. this will help to hold moisture in the tank
Get a larger water dish. The more surface are the better
replace both your day and night time heat bulbs with one of these:
http://www.petsmart.com/product/inde...AvailInUS%2FNo
The 100 watt version hooked up to a lamp dimmer will be ideal
lamp dimmer: http://www.homedepot.com/p/Lutron-Cr...H-WH/100145680
It also sounds like you need to replace your thermometers/hygrometer(s) I would suggest getting one of these. They cost $12 at Walmart. They measure 2 temperatures and humidity:
Do you have both snakes in the same cage?