A damp towel will also make the screen rust with time.
I like making a cardboard insert for the screen and then cover it with foil. Just make sure to lead a hole for any lights or heaters plus you need air flow. This is lite and can be removed easily if needed but it still works.
As for the humidity issue this is what I do. Take a handful of moss and place it in each hide. When a shed is coming keep the moss damp. When no shed is coming make the moss damp and allow it to dry out before making it damp again, this puts the humidity directly where the snake is most of the time so it benefits from it greatly. This will not raise the humidity in the tank but instead makes a micro climate in the hides and should help you alot.
I use this trick on my 40 gallon that has a 100w che and a 60w bulb and my sheds are great. Using the moss and misting once or twice a day you should be doing fine.
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