Sorry for the late reply, you have a good selection of angels and even so with your description you seem to have done a great job, managing coral beauty and flame angelfish in a place with more angelfish is quite difficult as they take over the tank quickly and regularly they don't allow more angels, the same goes for P. imperator, so they seem like the least appropriate angels to add as the first option if the goal is to keep multiple angelfish at once. I have also read horror stories with any member of the Xiphipops complex, that's right, the smallest of the whole family, these guys get to behave like real miniature demons, lol, but reading cases like yours, with success with all these fish it is encouraging.
As I mentioned before, I plan a tank of approximately 120 gallons, one of my biggest wishes is multibar angelfish, it may be one of the first to be added to the tank, a few hours ago I saw one available here but it didn't look good, breathing hard difficulty and lethargic, is not a good sign.
You are correct about Centropyge argi, it's commonly called pigmy angelfish, almost automatically, and people forget that it's a complete complex, Centropyge resplendens comes in here, an amazing fish and my favorite of all time, but C .argi is the smallest of all, and also the easiest to find.