To be perfectly honest, I'm more drawn to this statement when it comes to you inquiring about temperatures: "...and there is also an UTH which is simply plugged into a socket." An unregulated UTH will be much more of a threat to your eventual new addition than being worried over a couple degrees of ambient temperature. I would move your Inkbird thermostat probe to be in direct contact with your UTH (sandwiched between the mat and the glass if possible; if not possible, then taped directly to the underside of the mat) to control the heat mat and use a rheostat/dimmer switch to control the light bulb. You'll end up with safer temperatures and extend the life of both your heat bulb and your animal.
Here's a good place to get some ideas on how to properly set up a glass aquarium: https://ball-pythons.net/forums/show...With-Pictures!
And, of course, a good visual on how to properly use a thermostat to control a UTH:
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