I don't have a particular "bar" solution that I love for these capsules, but I have found that when I go to set them up by eye, I nearly always underestimate the angle that I should set between them. It's like my brain says, "No, that can't possibly be right." So I cut out the two adhesive corners of a Post-It note and attached them to the tops of my capsules, like in the picture, and the idea is that the points should face front.
I use a wider spacing between the capsules than this, of course. (Also, I attach them to microphone bodies and cables and a recorder--I've found that that helps.)
Is that optimal for these? Perhaps from further back for a PAS?
I usually run them at a much narrower angle, though up close to the source. I'm not going for a wide soundstage (and rarely record PA's). With the dots basically straight ahead or ever so slightly turned out from that at stage lip I get a very nice sense of spatial representation (you can hear left, center, right and exactly what instrument was where on stage) and I'd rather keep the audience behind out of the mix to the extent possible.
If I need PA I may move back a little and turn them out more like you show but have never run them turned out that far.
Once or twice I've sort of X-Y'd them (pointing them somewhat overlapping, so rotating your outside angle to the inside angle) when a little further off stage but trying to get the stage sound.
Though perhaps you could point them almost anywhere other than backwards and they'd still sound great I'm wondering if I'm missing something. IMO you probably know as much about their line as the factory so I'm curious. Nothing I've made ever sounded like I screwed it up but now I wonder if there might be some other realm I missed?
Of course I don't have two sets so have never really been able to do any apples to apples comparisons of angles and the results. Apparently some have run them horizontally (under some duress) and still been happy...