Hi,
You could try insulating the back sides and bottom of the tank with foam board or cork? You could also cover part of the top as ( guessing with the amount of lamps ) it sounds like a screen top. Or you could get higher wattage lamps on the thermostat - say arounf 100 or 150 watt red lamps ( either way you need to make sure the snake cannot get to them and be burned as a result.
Showing us pictures of your set up would help us give a lot more specific advice if you can.
dr del
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