Thank you so much for your reply. I will switch to plexiglass. I'm a sucker for aestetics and foil/plastic wrap is not the nicest lol.

At the moment I'm using a Pangea UTH and a 40w CHE. When the CHE is on, it is more than enough to raise my ambient temperature (almost too high sometimes). When the CHE is off, ambient rests around 75F. When its on, there is no limit how hot it can get. The problem isn't getting the ambient temp high enough. The struggle is the stability of it. I obviously need to put it on a thermostat on the CHE and it would solve that problem.

The main thing is getting the right ground temp from the UTH. It is set at nearly 100F and I'm still only reading around 84-86F on the glass and top of substrate (mind you my thermostat varies 4 degrees so it tends to need to be set slightly higher). I'm also concerned about the doming happening due to the thermostat probe being in between the glass and mat. My tank is slightly lifted to allow airflow and therefore does not have anything to press the mat against the glass.

I do have a stick on thermometer in each one but I obviously need to move it lower in the tank and add one on the cool side. Does your thermometer have a probe? What brand of thermostat do you use? I've only had them less than a week so no sheds yet but I will check. I'm only misting as needed, and nothing is staying damp. The humidity spikes usually happen just after I've misted and the CHE is on.

Small conclusion: plexiglass, maybe a better heat mat, get CHE's on thermostats and get more thermometers.