I think the sunglo bulb is a white light. If so, do not leave it on all the time. It would stress the snake out thinking it is day time all the time, especially when the snake is nocturnal. If you are going to use heat bulbs, get an infared bulb. They are red and the spectrum of light is one the snake can't see, so they think it is night. You can leave it on 24/7.

Also, I'm not sure if Petsmart actually carries thermostats. I know the store I work at doesn't. We carry something called a rheostat. You could use one of those for your UTH. With that thick bedding, you won't be feeling a lot of heat coming up from it. The snake would have to burrow down into it to get close to a UTH. Thin out the bedding a little and this should help. Also, our skin temperature is a lot different their our body temperature. It is several degrees cooler, so things will feel warm to us that are below our body temperature. I think it is somewhere in the 80s.

My advice would be to put a UTH on the tank, run it on a rheostat and bump the temperature up to 92. Try not to use any bulbs that are white light. Infared is best if using heat bulbs.