So I just moved my BP to an Animal Plastics T8. Using a Herpstat 2 thermostat with a brand new Pro Products RHP and RBI heat tape UTH.
I have the RHP set to 80° and the UTH to 90°, but the RHP is reading 126° at 0% power (right now) and the UTH is at 78 at 100% power (but has yet to make it to 90°, that I've seen since installing it).
The RHP probe is mounted above one of her hides, about 3" from the floor of the enclosure, and the UTH probe is mounted in the slot provided by Animal Plastics under the bottom panel.
The Herpstat 2 is set to daytime mode only with pulse heat. Not sure what the hell could be causing this but I'm definitely concerned. The Herpstat 2 WAS working fine in her previous 10gal aquarium setup with a UTH and CHE.