Where did the diagnoses of septicemia come from? Same place scale rot came from?
You have been given some good advice. Sure some have shared some ideas and information that is different than the others but your gonna get that.
What bothers me is you have not only been given good ideas, but good pieces of equipment to get, people to talk to, and books to buy. Other than you covering the little screen on the front of the cage in the very beginning I have not seen you actually use any of it. I don't think making a call to one of the given experts would have been very difficult. They would certainly be able to tell you what is wrong with the setup and get you on the right track.
You don't answer the questions asked. You don't post pics of the snakes skin. You don't run us through the current setup. I don't think you are stupid but I do feel like you are hiding something. We can only help if the person asking for it helps us. I say it often, help us help you. We are not there and can not see what you see so without you giving us good details and some pics we have no way of knowing what you are dealing with there.
I wish you luck.