So, to itemize what people have already said into one handy list,

1) Those stick on thermometers are wildly inaccurate. Get an Accurite digital thermometer/hygrometer from Wal-Mart or Home Depot for about 15 bucks, and put the probe right on the glass on the hot side.

2) After doing this you'll probably find that your hot side is way too hot. Get a simple lamp dimmer from Home Depot for about 7 bucks and plug the UTH into it.

3) Those half log hides do not make the snake feel secure. Get another hide identical to the one on the hot side, or make two new ones out of margerine tubs or whatevs.

4) Clutter up the tank a bit. You could even pick up branches and things from outside, so long as you clean them and pop them in the oven to kill parasites.

Once you take care of that, you should have a happy, healthy snake. Any changes you make after that are gravy.