Yeah I always end up in that area myself, where the cap & cone meet, sometimes nudged a little close to the cap, sometimes nudged more to the cone, but generally that exact spot is pretty much a winner. I would see the way Ryan does it would be good for tones I try to get, not that I'm good at mic'ing cabs or anything... I will be trying his positioning on my current project, may end up moving the position closer to the cap or even to the point where it's like figure B (the "typical" placement), but we'll see.