BP surface temp question...

So I finally got my rack all set up and insulated, it holds heat very well. I have four babies living in six quart tubs on three inch flexwatt for belly heat. I was having some difficulty with tub ambient temps being usually around 75 so I upped the temp in my whole room to about 79-80 and now im getting 80 deg ambient temps inside the tub.

When I temp gun the actual surface of the tub that rest on the heat tape I get a reading of anywhere from 90-95.

I have since added about an inch of substrate and the snakes.

When I temp gun the snake, after living in the tub for a day, I get a reading around 85 deg. Is this ok? Do I need to move the substrate a little to get them on that 90 deg tub surface? Im guessing the snake will do it on its own.

What temp should the BP be at when I temp gun the actual snake? Does it sound like things are good?

Thanks in advance for the help.

You should be concerned with your ambient temp and your hot side temp, which (as a rule of thumb) should be arround 80 degrees and 90 degrees respectively. Your snake will use these temps to thermoregulate itself, therefore the snake temperature will not be consistent (like with humans and mammals) but it will usually fluctuate between those 2 temps.

Regarding the hot side temp, you should be concerned with the temp under the substrate, on the actual surface of the tub, since that's the hottest part of the tub your snake can get to.