You are doing the gods' work. Keep MILF, she's a MILF:).
One thing is that Angel Step only always shows feathers if you do AS B. AS AA and AS K don't have that, it looks like a normal move if you do it fast enough, hadoken style
I agree with Mr. Muffins above. Character tier is one of those "If you gotta ask..." things. Even then, it is also seeded with some opinion and some characters are better against Mina (or anyone else) than others.
Mina's biggest weakness (from my experience) is fast, close characters that...