For one 88 is WAY to hot for most colubrid species.
I keep all my colubrids at 82 room temp and thats it. Anything higher can casue stress,regurgitation's and not using the hot side.
Not to mention that if it's 82-86 on top of the substrate, most snakes will end up pushing the substrate aside and it's a lot hotter on the actual cage bottom where the heating makes contact with the cage.
1.0 Normal - Maynard
1.0 POG - Victor
0.1 YB - Diana