I also use a 40 gal breeder for my snake. I have cypress mulch to aid in humidity, it doesn't mold if it gets wet, as aspen sometimes will. I have to keep the lid covered with aluminum foil and a damp warm towel to retain the humidity. When I see that my snake is starting to get dull and a pink belly I place damp moss in his favorite hide and add extra towels on the screen. This keeps the humidity around 65-75%. Just make sure the towels don't touch the lights.
I don't use an UTH, but have heard that you can put the water bowl over that as well to help boost humidity. As long as you keep your humidity up, he should not have bad sheds in the future. Good Luck
I have pics of my set up on my profile page if you need a visual aid
Seeing other peoples' set ups helped me a lot
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