Yes you are loosing all you're humidity because your tank is to open with the screen and vents. I use cardboard cut to the size of the screen lid. I then cut a window to allow the che and heat lamp to be able to pass the heat into the cage. I then wrapped the cardboard in aluminum foil and placed it on the screen. I have also used the tape method but I like the cardboard better because I can lift it away if needed.
Also on the front of that style tank is a air vent running the full length of the front. You can use electrical tape and cover all or a large portion of the holes to help hold humidity. The electrical tape blends into the plastic and it will not look bad at all. And again electrical tape is very easy to remove in case you need to make any changes later.
I would also buy moss from the pet store. Dip a good clump in water and lightly ring out. Then place these clumps in each of your snakes hides. This will create higher humidity directly to the snake since its hides are its main hangouts. I allow the moss to dry and then mist it well or give it another dip. During a shed make sure to keep it damp and your sheds will be much better.
With these changes you should be having prefect sheds in no time.
As for any side or back covering, its got nothing to do with your humidity but can add to the feeling of security of the snake. I used heavy art paper and it actually insulated the cage a bit and raised my temps about 2 degrees.
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