I wouldn't fuss over what the temps are in the low range just make sure they arent being burned. I don't really care what people have to say about my methods but i just use my hand to test the temperature. If its too hot for me itll burn the bp for sure. If it is hot but I can handle it its about 100 degrees... still too hot. Once it is mildly warm I find that is the best for the hot spot and the cool end is ussually many degrees cooler so there is a gradient. My snakes feed multiple times per week, shed whole every time, never strike, and never regurge. Also never had and RI (knock on multiple wooden surfaces....) and I have never used a hygrometer. Just make sure you snakes are happy, and they usually do a good job of letting me know when that is. Good luck mate.