Did this behavior switch happen around the time your vet gave Atticus the all-clear? If so, there's a chance that he's actually feeling well enough now to express his true personality. Reptiles are very stoic creatures. Sometimes, when they're not feeling well, they actually act more docile than they would be otherwise. While rosy boas are ultimately sweet snakes, a few of my friends who keep them report that they can be very food-happy little chompers, almost like they're mini womas!
It may well be that Atticus has recovered well enough under your care to get his appetite back. That could explain why he's become so nippy lately -- he may actually be looking for food. Alternatively, he may also just want a little more time to himself without handling, and asking you for it the only way he knows how (ie. nipping and being defensive).
Try giving him a little more space and start some tap training -- you should be able to find a thread or two on the later if you use the forum's search function. If he's just foody, the tap training should help with his nippiness. Stay in touch with your vet, and give them a call if you notice any signs or illness or strong, unusual tics. Good luck!
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