As a follow up to some of the responses I hadn't seen yet:
* I think the husbandry is there - he's in a Animal Plastics T8 with a Pro-Heat RHP and Herpstat shows all the temps correct, and my humidity gauge is spot on.
* He does seem awfully big to just be having one mouse a week, but he recently already had a major food increase, so I guess he's just growing fast!
* Never knew about the head tap thing.. but he's never struck at me. He's hissed a couple of times (when I've startled him, I think), but even then once he realizes it's just me, I can usually pick him up with no issue. Just wanting to make sure it stays that way!