This problem is simple, it appears you have too much heat, colubrids only need a very small spot to warm up. With small cages, larger warm areas heat up to much of the cage.

I am not sure what your doing but if you keep your room the same and add a hot spot, just to get the same lower temps, you will be required to lower the room temps.

As I have mentioned many times, these animals are cool based, and move to heat as needed. Some species use more heat then others, but if you allow choices, they will pick what they want. Cheers

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