The moist towel will do wonders. The lamps (you only need one black light ) goes on one side of the cage (the same side as your UTH). Here is a good trick meaning you can't get a thermostat right now but it will take a few days to dial in just right. Put the UTH on a timer and figure out how much your heat drops to keep it constant if that makes sence. I bury the access wire from my probe and put the acctual probe on top of my substrate. It is gonna take some time to dial in your tank but once you do it is like clock work Like I said before if you use hot water for your towel it will raise the temp in your tank. But it will also hugely boost humidity. I run my black light 24 hours a day. It is on a light dimmer so I have a bit more control with it. If you are still having issues personal messages and I will try to help the best I can. Remember pictures help a lot so we can see exactly what is going on and can make corrections better.
Good luck