I'd also run A-B for stack taping, it's not like there's much of a stereo image in the music to preserve, so it's more important to keep the signal on axis.
That said, if you run cards A-B with your head in between them, there's still a baffle attenuating sounds from the opposite side. So AB stealthed cardioids can still have a decent image....but of the room and crowd rather than the music if you're right up against a stack.