Is My Ball Python OK?

[NH93]

I keep the mat under an inch or so of Aspen Bedding,
The mat heats up to 118 degrees
The aspen bedding above it heats up to 95 degrees,
The Cardboard Mat above it heats up to 90 degrees, and has aspen bedding throughout to allow cool spots.

This seems fine to me, is it not? The temperature has been constant

No, that's not fine. 118F is enough to burn your snake, which is what we've all been saying this entire time.
Snakes push aspen aside. An inch is not a lot of bedding, and can easily be pushed out of the way. Constant roaming is usually not a great thing, from what I've heard. Typically - if they are not hungry or in breeding mode - they are TOO HOT. They can get touchy (ergo the hissing) if they are too warm as well. They can hiss without being too warm, but it can add to it.

You asked a question, we all answered pretty much the same. I apologize if it's not what you want to hear, but it's the truth. Thermostat.