The glass is loosing heat and the screen. You have a 100watt heat lamp you said correct? That is more than enough for a 20 gallon tank. Cover most of the screen except for where the Heat Lamp is, also 3 sides of the glass with Cardboard or foam insulation board. Move the Heat lamp a bit closer to the cool hide for now so she is at least 80. Use you temp gun ontop of the hide to see what the temp is after a few hours. Check it again in the morning as it can take a long time to regulate and might be to hot. Until your Thermostat comes put a piece of cardboard inside the tank over where the UTH Hide is so he doesn't get burned by the 122. That should take it down to a temp a lot better for a few day incase its to cool at night and trys to lay on it.
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