ever run XY on stage?
IMO, its the best way to do it.
blumlein is king, of course. and that has plenty of "rear lobe" facing the audience.
using hypers...w/that little rear lobe you mention, will not result in more crowd. that little squirt of pickup out the back is out of phase, and will likely result in a nice affect of realism. Just as the OOP information in blumlein and M/S works.
if you are asking me, Nick, about running XY, the answer is a no, I really dislike this configuration and never run it, it produced a weird and unnatural sounding recording the one and only time I ran it, which was in a small club about twenty feet back from the stage in a tiny place, the recording should have sounded great, mics in XY about 9 feet high lashed to a pole in direct center of the floor; results: a bizarre sounding recording made with my 483>MiniMe>DAP1 rig, check it out on the archive for a listen if you care to, its Signal Path from 5-1-04 and sadly I was the only taper that night, and I have not used XY since; now, quite differently, for a recording using DIN instead, and on stage, stream my recent Lotus show also on the archive recorded on 10-27-05, that's the real deal in my opinion and illustrates the whole reason why I started this thread, a little more chatter than I would have preferred at moments but there were people directly behind my mic stand the whole show, but thanks for the mic configuration suggestions nonetheless