This is wrong in every way!!
You measure your temperature in the surface that your animal can touch. Snakes can and will burrow so if you are getting 90 degrees on top, you are getting cooking temperatures under.
Temperature needs to be taken under the substrate when you are using any UTH options. There also is no need for that deep of a substrate, 1/2 inch is more than enough.
If I am remembering right, the 114qt is the same dimensions of a 41qt but way taller? The height is not needed and may hurt husbandry as far as heating and humidity. For a one that small, a 6qt is enough and net step to a 28qt.