Welcome to the forum!!!
To answer your question about placement of hygrometer and where to measure temps, it's important to think of where ball pythons spend their time...on the ground (underground when they can) and hidden. So that's where you want to measure temps and humidity.
There is also no need for a night time temp drop.
You already mentioned that your humidity is a bit high, which I agree. Aim for closer to 60% and bump to 70-75% during shed.
Feel free to ask any questions you may have, we're happy to help!
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