When I was watching yumekami's C-Ciel matches, I noticed that after 214[A], he would do 2C 5C 2B j.BC sdj.BC, etc. Then I compared the damage with ...214[A] 2C 5C 4C j.CB sdj.BC etc. 5C into 2B ... actually doesmore damage than the 5C 4C... variant. About ~50 more, so it doesn't seem like much, but it's definitely more and not hard to do. Also, it would probably be a good idea to get into the habit of doing 3B after a 1-hit 2B if you're not sure if you're close enough to get 2 hits out of the 2B. This way you don't lose your combo due to spacing issues.
Random Note: This may not be new, but for C, 2B and 4C can still clash. I don't get these to happen frequently but it's still possible. I've managed to get 2B to clash with a heat activation and 4C to clash with a fireball.