so i'm going to critique your set-up; some of my advice should help with humidity as well!
1. cover 3/4 of the sides with dark fabric/paper: this will help the BP feel more secure
2. have 2 identical hides: this offers the BP the security they need on both sides of their enclosure so they don't have to choose security over regulation
3. ditch the bulb when you can: they suck the humidity out very quickly. if you're having ambient temp issues try a space heater or a Radiant Heat Panel (i don't use an RHP so hopefully others can offer advice there)
4. i believe aspen is not the best substrate when you're having an issue with humidity (hopefully others will offer an alternative; i use Repti-Bark or ReptiChip)
5. if you have a mesh top to your enclosure, cover it with saran wrap or tinfoil with slits cut into it so there's air flow. this should help hold humidity.
6. ditch the dial/analog thermometer, they are very very inaccurate. here is one i use.
others might have different advice than mine but these are guidelines i see a lot and have followed myself. this will help you have better control over your enclosure and should ensure a happy BP![]()