I wouldn't jump to IBD so quickly. That gets tossed around WAY too frequently in terms of BPs in my opinion. IBD is a disease that can be carried by boas with no outward symptoms, but it will kill a ball python pretty quickly, within a month from everything I have read. I seriously doubt the behavior is IBD.
Are you sure the mites aren't back? It sounds like they might be hatching and causing your snake some discomfort. He/she doesn't have arms and hands to scratch those itches, so he could be trying to get rid of them. You may want to give another mite treatment and see if that stops the behavior...
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