1. I noticed today an odd mark on the belly of my new BP (3mo.old) It is a dark grey brown streak running down the middle of his belly, about 2/3 down. It seems like the scales are broken... could it be a scratch? It isn't bleeding, though he seemed pretty keen on not letting me touch it. Any advice?
Belly button , you can post a picture but this is likely what it is from your description.

2. Fed the little BP today too. And apparently, he is either a world-class clutz or he is blind. He immediately curled into a striking position when I displayed the mouse (pre-killed), but he struck a full 2" off target and struck his plastic hidebox. Twice. He also managed to strike and bite his driftwood as well, before finally getting the mouse. I watched quietly and he didn't seem to have any problem at all getting it down, and took off to his basking hidebox without hesitation.
Make sure the prey is warm enough, if not they will often hit and miss.