Works fine. Stomp earlier. You should be stomping before the other guy even lands.
Okay, I tried that. Here's what happens:
After Rachel's 9K hits me,
I mash 4G (while still in the air and the dummy is going for the Stomp), one of two things happens depending on the timing that Rachel does the stomp:
1.) I Tech Roll backwards, and avoid the stomp entirely.
2.) The stomp connects (this takes strict timing on Rachel's part), but the 2nd part, the kick that force-techs, whiffs.
So I wanted to know if you tried this yourself and got the same results. I picked Hayabusa and recorded Rachel doing your 9K into Stomp set-up with different timings, and got the above.