I'd scrap the skull thing and put another hide in there. If it's not in a rack, the snake will benefit from having two hides, on the hot and cool sides. with your water bowl, humidity should be no problem. You may even need to make some holes in the tub to let out some humidity. If the humidity is correct, the snake won't need the skull to shed.
Once the temps and humidity are in check, i'd start offereing food again.
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