Warm end temp is measured on top of substrate with IR gun (just confirmed it at 85). The area she tends to hang out is slightly cooler. I adjust warm side temps according to snakes' behavior, and set it so I see regular thermoregulating between zones. Her body surface temp is currently 81; one of my own 2021s body temp just measured at 79, my adult male at 80, and my pregnant female at 84-85.
Feeding is roughly once a week, though because of the slight thinness I'm starting to to bump up to every five or so days.