I appreciate all of the input! I just put black foam board on three sides this week. Working on finding the Tstat setting that gives me a 90° glass temp, but the one I have has a 3° or so swing.

I'll be getting a digital humidity gauge tomorrow, I'm planning on having it located centrally, an inch or two above the substrate.

I recently bought a humidifier in an effort to raise the humidity in the room in general. It'll just be a lot of learning and adjusting as I get this dialed in, I suppose. It's fun!