One quick thing. On Rachel and Tager, you want to knock them out of the field slightly, then pick them up with 5DD 6DD 2DD etc etc.
Also, a quick list of corner 3C variations.
3C > 214A > 2C > j.C > j.2C > 214D > 3C > 214A > 6A > j.DD > 214D > 3C >236D
Works on: Hakumen, Bang, Jin, Ragna, Litchi, and Tager.
3C > 214A > 2C > j.C > j.2C > 214D > 3C > 214A > 2DD > j.DD > 214D > 3C > 236D
Works on : Bang, Arakune, Jin, Ragna, Tao, Litchi, Tager, and Nu.
3C > 214A > 2C > j.C > j.2C > 214D > 2B > 2C > j.DD > 214D > 3C > 236D
Works on everyone.
Damage differences don't seem to be that much, so whichever is easiest for you.
Also, a quick bit of fun: http://www.youtube.com/watch?v=hkBaRgPSpF0 (simple, easy, completely impractical)