LOL, thanks for the advice...I don't actually use her, just picked a character at random. You have a really solid Rachel, but I noticed you don't do a lot of the set-ups I saw at TFC, i.e. end air grab combo with her 2K...
Free Step Dodge
RiBu
Cla
From what I understand, stomp is never guaranteed in a combo. You can always back-tech to avoid it. If I see my opponent knows to back-tech it, I won't bother to try ending a combo with stomp anymore, and I'll just go for more guaranteed damage instead.
Cla
It also seems to be harder to do stomp in a combo against heavier chars since they fall to the ground much faster. But I will experiment with this some more in the lab.