I have a 6"+ Queen, 6"+ imperator, 5"+ Koran, 4"+ blue face, a 3" Flame, and a 4"+ Swallow tail in a 180 gallon, there are also about 10-15 other fish in there. I am looking to put in another 1 or 2 large angles. Those who have seen my tank can tell you if the fish looks healthy or not.
The key is to get healthy specimens, take your time finding them and place the least aggressive fish in there first. I like to buy my fish after seeing them for my self and is fairly sure it is disease free, I try not to buy them based on seller's word they eat, looks great..blah blah blah.. Most fish store\business if out to sell the fish as quickly as they can and will say what ever to sell the fish. Those fish never survive for me.
Make sure you feed them a variety of food once they start to eat, mysis or brine shrimp along is not good.
I do think you should go with only one dwarf angle, they are mostly mean fish.