The top line is still a weird mix of blue and black. Why not try coloured outlines, black on the shadowed/lower sides, blue on the lit areas?
As for AA, I meant internal AA if smoothness is very important to you. In my opinion, you don't need to smooth anything at all, it looks fine. The blue/black, in any case, isn't helping to smooth it at all. Coloured outlines would reduce contrast a little bit which could reduce jagginess, but imho you're working with such dark coloured for the lines that it won't make a noticeable difference.