It's really a pain against some characters. Lambda is a good one. her crouch box low-profiles 5b, as does 2b and 3c. the typical range you're at after a knockdown is too far for 5c. If you rush in early, she might roll instead, so that's some form of mixup (not very good, tho). 2b is too slow. when you do punish them for it, you can punish them HARD* though, but it's crazy annoying still.
* For Tsubaki