Not totally uncommon for bad sheds to happen. Especially if recent cage change. Also too much humidity? no such thing with an ATB haha Seriously though, humidity is tough, if there is too much air flow your initial readings can dry up really quick, not enough air flow can cause mold so it's a tough balance.
I only mist when I see them going into shed but have naturally decent humidity in my area. Every once in a while I'll get a bad shed (mostly the one that has a screen top tank of course). I know a lot of people on this site say never soak but I've have had good results from soaking. What I do for an ATB is get a towel wet (or for a really little one, a bunch of moss), wring it out and put in a tub with the amazon over a heat pad and let sit for at least an hour. Then either put ATB back in cage and they get it off themselves or help hand shed them if they seem agreeable. If you don't want to go the soaking route, just keep misting, maybe dump the water bowl and hopefully he'll get it off.
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