I'm constantly doubting the proper way to keep the substrate temps in check. My thermostat probe is siliconed to the bottom of the inside of the enclosure, and having it set to 105f gets the substrate (layer of husk) to about 89f.

This means at the bottom of the enclosure, if she were to burrow a bit, itd be 103ish, give or take. Checking with a temp gun confirms this, though once the substrate covers it it's fine.

Even her moving it around can change these numbers drastically.

What do?