Minor quibble: an incandescent bulb can be thermostatically controlled. A simple on/off stat would be expected to blink the bulb unacceptably, but good units such as Herpstats have settings that make incandescent bulbs usefully controllable. That's not to say that an incandescent bulb is a great option for a snake that isn't primarily a basking species.
What is the ambient air temp in the room? That will affect the temp of the cool side.
The light for the plants is adding to the heat in the enclosure. It looks like there are only plastic plants in the enclosure, though? The T5 UVB lamp is adding heat, too. Both of those could be replaced with an LED strip for viewing light and photoperiod if need be.
There doesn't appear to be any real ventilation in the enclosure; the photos seem to show only the two vents in the back near the top, and those won't move much air (since they're not placed to allow warm moist air to exit and cool drier air to enter). Part of the issue could be that the box is simply sealed up too tightly.
That enclosure will probably get some heat from the enclosure underneath it. If that's the case, raising the top enclosure on small spacers (1/2") that leave an air gap that's open to the room will allow heat from the bottom enclosure to dissipate into the room; four square 1/2" dowels, each 2 feet in length, placed under the top enclosure from front to back would do it.
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