I just wasted 20 minutes because of ShelledMenace's combo video transcription error. In the second combo he lists, which starts at around 3:00 in the video, when you first enter the 4c 4a loop, do not attempt 2AB 236a 4c 4a. Fatal counter or not, you just won't manage to make it work. I went back and watched the video very closely, and he only has cyclone gauge level 1 when his first 4a connects.
After discovering this and bringing it back to practice with, I attempted this change and it worked perfectly, up until I was hitting the third 4a. The third 4a was falling through and the combo was dropping because a 4C does not keep Akihiko in the cyclone state for long enough to tack another 4a on. I re-referenced the video to figure out the problem, and indeed the two last "4a"s were making a deeper sound on contact and doing more damage than the ones in my training mode.
They were 4Bs.
The verdict? The real combo transcription is
5B FC 236B 6C/D BD 2A j.c. j.A j.B (land) 5AA 2AB 236A (4A 4C 4A 4C)x2 4B 4C 4B 4D Cyclone Upper
ShelledMenace, if you could please swap this in for what you've posted via edit, that would be great.
Some players may not wait to read Page 2 before they've practiced the combos you've transcribed.
Edited with further info (about the 4as being 4bs)