Slightly off center and almost touching the grill is pretty standard placement for micing a cabinet, I think! I usually try to make a tangent line between the 57's capsule and the cone of the speaker.
I'm right there with you about the B52 on a kick drum
that's definitely my preference too unless the kick drum doesn't have a port, in which case I usually go for a D112.
One could mic an entire band using just 58s and 57s, if push came to shove. Live sound can be a weird thing lol