UTHs do nothing to heat the air so how you have it mounted is not serving any purpose at the moment. I would unplug it. Get a good tstat and then move it to the bottom where your ball can really use it.
Your tank looks pretty good but I would recommend lowering the gauges a bit since you want to know the temps near the snake. I would remount them about an inch from the tank floor.
Also it is best to have two hides, one cool, and one warm. Its good you made the half log more suited for the needs of a ball, just make another.
One last thing. Its a pretty safe bet that you are going to have low humidity with how the tank is set up now. Get some moss and add it to both hides. This will add more security to the hides and provide the snake with the humidity it needs.
If/when you remove the uth from the side do it slow and with as little bending as possible. If you break the heating elements inside it will not work correctly. Once you have it off stick foil to the stick side. This will allow you to remove it easily when moving the tank, upgrading, or cleaning. You can use any good tape to secure it to the tank bottom once the foil has been added.