Task: The Nexus Exchance (Or why Director Tann can never be happy)

It feels a little silly to make a thread dedicated to a kind of one-off quest, but I'm slightly frustrated and curious to see whether anyone fared better than myself. Now, this is the quest where you talk to the Angaran's on Aya and interview them about moving to the Nexus. Considering there are only three NPCs with two possible answers each, I didn't feel there were a lot of variables in the process of the quest -- and yet, no matter how many times I do it, no matter how many combinations of responses to the Angarans I run through, I always receive a message about how Tann was not thrilled about the results from the Asari ambassador on Angara. Has someone managed to eke out a different response? Is this a bug, or just another way of drilling home the fact that Tann is impossible to please?