My tank set ups as,2 hides,one on hot side one on cool...a heat mat on the warm side and a uv and heat bulb I thug warm side as well..a red light night time heat bulb at night also. A heat strip thermometer on the hot side and a dial hygrometer in the middle of the tank ,leaning more towards the warm side...some plastic plants on both sides and a wet rag on the top of the screen covering 60% of the screen.. My humidity I keep at 55-70 and the tempos the hot side is always around 86-88.. I also spray mist the tank2-3 times a day to keep humidity up. I have no thermostats set up controlling anything. My snakes uses both hides fine,eats regularly,but I have him only 3 weeks and is yet to shed,has pooped a dissed normally. A few buddies that have snakes have the same set up as me,which is where I gt my advice from,also spoke to a guy at the recent reptile expo who had a few bps and also told me the same set up he has that I now have,he as well don't have anything regulating his lamp and pad. Neither do my friends. I also have the back of the tank covered and that's it,not the sides. My one friend has the same be up as me and hissed tail boa was one foot when he got it,4 yrs later it's now about 5 and eating and shedding perfectly fine.
You will drive yourself insane if u try to control every single inch of humidity t the cool side to the warm side,u will go nuts,cause don't forget the inside temp your place will also affect the temp and humidity,that's common sense. Keep it simple,he will be fine.
here is my set up http://imgur.com/8gjLvzX
the bottom tank is what I'm starting to get set to get my second BP and the LI reptile expo on Oct13