Ok, this is getting really frustrating. I really don't know why I'm stressing about it either, because my BP is acting/looking/eating just fine... I'd just like to get a better range of temps for him.

The Problem:
Keeping the "warm side" up to 90-94 degrees around the clock.
Keeping the range at more than 5 or 6 degrees from warm side to cool side.

The setup:
I've got a 20g long all-glass viv covered by a locking screen top. Aspen substrate. A "half moon" tree trunk hide on his warm side, and a "ceramic" or some other hard material tree on his cool side that the branch is high enough for basking and he seems to enjoy climbing on it (mainly just to be closer to the exit of his enclosure I'm sure). He used to enjoy hiding underneath the tree, but I don't think he can fit under it anymore. (i.e.... I know, I know... I'm gonna get more hides that he can actually fit under soon). There's an UTH on the warm side (24hrs) and a combo hood that covers the entire top of the viv with a UV light that's on from 7am to 8pm. There's a 100watt white basking lamp on the "warm side" that's on the same time as the UV light, and a 100watt black heat emitting lamp on the "cool side" that's on at night. I live in Tucson, AZ so I'm in a very dry climate. The RH inside the house is around 20%, with the A/C on. In the viv, I see humidities settle at around 25 to 30% naturally, and with misting two to three times a day, can get them to around 48%.

Observations:
During the day while the UV and white heat lamp are on the warm side gets to about 91.4 degrees and the cool side is around 85. At night, when the black light is on, the warm and cool sides have sometimes been recorded to be the EXACT same temps. Sometimes, however, I get a 1 or 2 full degree spread from warm to cool side. He reacts right away to the lights being turned off and usually comes out of his hide to go exploring and trying to find a new way to escape. He's active for most of the night and when the light is turned back on in the morning, he settles back down and hides NEXT to his tree on the cool side hardly EVER using his warm side hide.

Wants/Needs:
I'd like to get the "optimal" 90-94 warm side, 80-84 cool side 24 hours a day, I'd like to get the humidity up to 50% 24/7 and I can mist regularly to help with shedding up to 65-70%... but with the basking lamps, the uth, and the dry climate I'm in, misting seems to only provide about an hour worth of moisture until it's completely dry in there again... it's like his viv is just being dry baked!

Thanks for reading my novel, and any suggesting on improving/changing his environment would be awesome!