First of all, those thermometers you have stuck to the glass are useless. They measure the air temp around them. You snake does not crawl along the side of the tank, it crawls on the bottom.
The temps are critical on the bottom, the temps of the air inside the tank or the top of the tank do not matter.
You should have at least 2 hides, more is better, but a Minimum of 2. One hide on the cool side of the tank and 1 hide on the warm side of the tank. You should measure your temps from "Inside of those hides"
The warm side Hide should be placed directly over the heat pad, and the cool side hide will be room temp.
Your snake has the choice between the 2 hides. If it wants to cool off it will go to the cool side, if it wants to be warm it will go to the warm side.
The temp inside the warm hide should be between 83 and 88, year round, and the temp inside the cool hide should be about 70 to 75.
All those lights you have on top are not needed. In fact if they stay on all the time you might actually be harming your snake. They need a regular day and night cycle to keep their metabolism and sleep regular just as in the wild. You should have 12 hours of light and 12 hours of dark.
I use a regular room light from across the room and it's on a timer. I don't have to mess with it. I have 2 heat pads. I have 1 heat pad under the warm hide that keeps it at 85 degrees all the time.
I have a separate heat pad under the cool hide that only comes on if the room temp dips below 70. It is set to 70 degrees and only comes on a few days each winter.
I have no additional heat, no lamps overhead.
My snake is Happy and Healthy and never been sick.
People forget, Corn snakes are not "Tropical snakes." They don't need a lot of heat.
Too much heat will actually hurt them.