personally for me a 30gal is a bit small for angels, when you've seen how they make use of a big 50/60gal tank you'd feel bad putting them in something as small as a 30gal.
your fish so it's your choice, just my opinion.
O ok, well unfortunately I don't have a choice right now. When my grandpa died I got one of his tanks, which is how I started with fish. My parents won't let me get any larger tanks as of now and since I'm with them I have to abide by their rules. I do not have any friends to give them too with a larger tank and none of my lfs's have room for them in display tanks and the one's I would trust giving them too won't take fish even as donations. If I can get my parents to take me too a local fish club by me i can see about finding a home for them there but for now I have no choice but too keep them in this tank. I do agree, they would like a bit more lenght to the tank as they don't move much from where they mate but the male gets spooked easily for no apparent reason and runs into the walls.
from what you describe thats typical symptoms of being in a tank just that little bit too small.
i appreciate it's not always easy and you don't have options, and there's certainaly an argument for you keeping them in a 30gal rather than give them to an lfs where you've no idea who will buy them and they could end up with someone who doesn't care and sticks them in a 10gal. just see what you can do