
Well I can't look at your set up without a picture...
It's also general husbandry to have a hide on both the hot and the cool side. And since you have such a big tank and a small snake you could probally put some in the middle too
And just to let you know stick on thermomters are highly inaccurate. You should get your self a digital thermometer with probe. Even if stick ons were good thermomters you still need to be measuring the glass at the bottom of the tank not the side of the wall.
PS-I'm not trying to get down on you or anything, just help you out.