Ok it isn't just you. Lots of these posts aren't making any sense to me either. Let me attempt to clear things up a bit.
First of all, Ashaya, the UTH should be stuck to the OUTSIDE of the tank, not the inside. If properly installed, the snake wouldn't be able to get to it anyway. If you have yours inside, remove it and install on the outside. That way, you won't have to worry about the snake getting under it.
Secondly, hides will not stop a snake from burrowing. It is instinctive for certain species to burrow, and they will do it whether there are hides in the tank or not. Mine will even crawl under paper towel or newspaper.
You don't need anything but your aspen in the tank. Even over the UTH. What you do need is a device to regulate the heat the UTH puts out. I use inexpensive plug in lamp dimmers from Walmart. Heat tape is an option for those with rack systems, but for one snake, a UTH is fine. With a dimmer or thermostat installed, the UTH will not get too hot.
If your house temps fluctuate, your tank temps will also fluctuate. This is not the fault of the UTH. Heat tape will do this also, unless it is on a thermostat. A UTH on a thermostat will stay the same temp, just like heat tape will. (WHy don't they make UTH with thermostats already installed?)
Finally, some people mount their UTHs to a ceramic tile. The reason they do this is so that if they get a new viv, they can more easily move the UTH, since it is stuck to the tile, not the glass of the viv. The tile does NOT go inside the viv, but rather under it. If you do this, you will also need to elevate the viv so that it sits level.
Other than that, your tank setup sounds fine to me. Remember, don't make things more complicated than you have to. All my vivs have just aspen (or EcoEarth for my ball pythons), two to three hides, the UTH on a dimmer, a digital thermometer with a probe, a screen top, and a water dish. That's all you really need.