As per the humidity issue, I have a glass screen enclosure (20 gallon long for now), and I am using Cypress Mulch for a substrate. I have one water bowl in the enclosure on the cool side and the humidity styas around 55 - 60%. I add a second bowl to the enclosure when he is getting ready to shed and that puts it up to around 65 - 70%. And if it begins to drop to low, I place a dish towel over the screen lid, and i do not use any kind of misting technique.

I use Zoomeds UTH (I think that is who made it), but you can get it from any pet shop that sells reptiles. I leave it on 24/7 with no thermosate attached to it, and the temp stays around 80 - 85 degrees. i turn on my heat lamp when he needs more heat. The cool side of the cage stays around 75 - 80 degrees depending on how often my house heater cuts on. Zeus really loves the cool side at that temp. I tried to keep it at around 80 and the hot side around 85 - 90, and he wasn't as happy with that temp range as he is with the cooler temps. But everything sounds good man. Hope that everything works out for ya.