I would not use omnis. The Vic's sound system does not fill the balcony with sound well, IME, so unless you're on the balcony's front rail I think you're best off using a tighter mic pattern to get "closer" to the sound source. Even at the front rail, I'd probably only use omnis if I could drop them down below the balcony, since that's where the sound is best. And even then, the balcony overhang itself causes some problems - reflections off the overhang if you can't get all the way below it, bass trap if you actually get below the overhang. It's a tricky venue for ambient recordings.
That said, I've never recorded from the Vic's 2nd section balcony, only the front rail, so maybe omnis would turn out well after all.