Honestly this is why I prefer slightly longer cages than the traditional tub length. Provided the snake has adequate hiding places, they still do quite well, and are able to have a much larger heat gradient.

I do find that our male tends to hand near the cooler end, only going to the hot spot(usually people's whole warm side) after eating or on very cold days. But since he does visit the warmest points, I like to give him the option to go there, as well as many options to cool off.