Cool.
I've been playing with mic positioning quite a bit myself, with the help of postings here, and I finally found a sweet spot. On my 4x12 cabinet, I place the mic 10 inches out and in line with the right, outside rim of the speaker cone ( upper right speaker ) and angled to point at the opposite side of "the little dome". Then crank the amp WAY up. Works great for heavy guitar sounds.
Of course that position probably isn't relevant to anyone but me. I guess everyone has to go through that process of finding the right spot.