I'm pretty new but before owning a snake I did piles of reading. It's just the practical application that is getting to me now.

I have a ~40 gallon glass tank. It's being heated with two uth's and a small ceramic heat emitter bulb. The hot uth is on a thermostat set to 100F and the cool uth (its in the 70's without one) is set to 90, with the probe attached between mat and glass.

Hot side temp measured with temp gun on bare surface: 94
Hot side temp of substrate 1/2-3/4" thick with thermometer probe: 88/89

Cool side temp measured with temp gun on bare surface: 83/84
Cool side temp of substrate 1/2-3/4" thick with thermometer probe: 79

Ambient temps with temp gun are between 78-85

This all holds within 1 degree overnight.

Is it okay to have a 5-6 degree difference between the glass and the actual substrate? Are the temps in safe ranges? I use exo terra jungle earth. Thanks!