Hmm...its been 6 hours with the lid tight and night is now falling. The temps are dropping slightly as was predicted.

Current readings;
HOT - 84 degrees. 45% humidity
COLD - 84 degrees. 51% humidity

These are ambient air temps only and do NOT include the hide temps.
The humidity now seems to be doing MUCH better and typically has ridden between 45 and 55 degrees ever since I better insulated everything. It took that hot side 6-8 hrs to fall to below 50%, which is a huge improvement, but the tank will probably still require 1x or 2x daily misting to maintain proper levels, which is no big deal.

What does concern me is that there doesn't seem to be a temperature gradient throughout the tank. Is this important? Or should I ignore it?
I assume since I moved the CHE to the middle it has more evenly and effectively distributed the temps as you can see in the reading I just mentioned.

I need to make a quick run, but when I get back I'll get some hide temps probed and we'll see how things stand with those...