Personally, I would not be concerned about a gradient of 82-84F. Plenty of keepers who use ambient room temperature (rather than heaters and a gradient), set their thermostats at ~82 year round (not including brumation of course, which many do in a separate room). My only concern is that your "cool end" is a bit on the cool side. Most sources suggest a gradient from 75-85F, although nighttime drop to near 70 is typically considered OK. Hope this is helpful
