Yes that's way too much substrate, I would use an inch at most.
You want to measure the temperature of the UTH on the glass floor since your snake will burrow and lay under the substrate on the glass. Your UTH should be regulated by the thermostat so that the temperature of the glass floor is 86-88*F.
I wouldn't bother with the heat lamp, just keep the room's ambient temperature around 74-75*F.
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