As I have said before, everyone on this thread will tell you to get a thermostat. But like Deborah said, you can lead a horse to water, but you can't make it drink. Obviously you are too stubborn to listen to any of us, so people are less likely to give advice and suggestions if you aren't going to listen to them.
On a side note, did you get your ambient temperatures figured out and has your snake eaten yet?
His ambient temps are fine, and feeding is scheduled for Tuesday.