The air above the UTH up so many inches is going to be about the same as the cool side of the tank. This is the ambient air temp of the tank. 75 is acceptable but closer to 80 is much better. The aera right on the UTH where the snake will laying on the bedding is where you want it to be 90/93. It will read a couple degrees higher than that on the glass where the probe is but the snake will be on top of the bedding. Put a lid on the tank with clips and cover it with something. Foil, a towel, whatever you have. Then check the temps again after awhile. This should raise the ambient temp to where it needs to be without having the UTH set so high.
You can cover most of the top. The snake only needs a little space for ventilation.
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