From what you've given, it sounds perfect. Just so long as you have the rest of the proper husbandry(multiple hides, humidity taken care of, etc) you'll be fine. I do think a 6 degree variance on the hot end is a bit inconsistent, so if possible try to keep it 1-2, maybe 3 degrees within its high and low. That's the problem with rheostats; you need to turn it ever so slightly more or less to get those precise temps.