Sorry I missed that new post!
Put the sensor at the substrate level. It reads humidity from the probe so you don't want to bury it.
I have a couple of those and I can say from experience that the humidity reading is not all that accurate.
Honestly, 80 degrees for a week is not a big deal. Just hold off on feeding til you have it sorted out.
If you are concerned about the temp, get a slightly higher wattage bulb.
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