These are the corner mixup combos I'm using. They're not the most damaging but they're very easy execution-wise (lots of leniency in timing).
b23, 22, b1 WE 3, 32 MC - 40% (overhead mixup)
b22 WE 2, 22, b1 WE 3, 32 MC - 39% (low mixup, then overhead mixup if blocked or continues the combo if not)
The hardest thing for me is timing multiple WE 3's. Also, very often after a corner WE 3 I'm actually on the other side of the enemy. If I try to do f13 I end up accidentally getting b13 which doesn't connect and leaves me very vulnerable. I don't have to worry about that with these combos because 32 after WE 3 at the end always seems to keep hawkgirl on the correct side.
I'm curious what the max dmg corner combos off of these starting mixups would be though (b23 and b22 WE 2).