Trouble having enough heat

[KMG]

The foil I guess is so that the cardboard isnt a fire hazard or to reflect some heat ? And I have thicker substrate than that. I was recomended that if I use coco mulch as a substrate the BP like to dig a bit, would you recomend me to take some of that off ? I have maybe 2 or 3 inches of substrate.

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Yes, over the uth it needs to be removed. If it's thick it can insulate the uth and get very hot. Then if the snake gets down there you can have issues. This is also why the surface temps are low. The heat is being trapped inside.

I keep my substrate thick everywhere except over any uth. Over my uth you can see mostly glass.