Walt, glad you finally came around to AKGs ; )
I've used 63s outside, and the main thing that's different to my ears is the lack of indirect/reflected room sound that's always a large part of what gets to the mics at indoor shows. I've found that if you set them up right, you can get a great recording with less local chatter around the mics picked up. Hypers can be tricky, as you know from your Neumann days. If the split/angle is too wide, you get an unfocused image with a hole in the center. If you point them directly on axis with the PA, the image collapses and can end up sounding brittle and lacking in bass just below the midrange, while sometimes still picking up the deep bass, resulting in thinness in the mid frequency range that makes vocals sound honky. Best advice, try to have the axis of each mic just outside the stacks as another poster suggested. Usually 75-80 degrees is where you'll end up, 25ish cm distance between the caps. Hope to see you one of these days. Do you ever make it back to the Va Beach area? Don't be a stranger. Later....