I hope these numbers are a typo.
Dave, what do you call within range? There seems to be some conflicting information as to the temp and humidity level in the tank. I'm not so concerned about the humidity right this minute, but the temps are another matter all together. Low temps could be the direct cause of the regurge.
That would be the ideal temp for the warm side. It's pretty standard, and listed in most any caresheet you choose to read.
That is an assumption, and with ball pythons, often an incorrect one.