Ok, so, I remember mentioning before that I usually do 4D to delayed Jakou instead of 4D~A to Jakou. I just tested them both out and figured out that I was wrong lol...4D~A to Jakou gives a bigger air boost than delaying a jakou. Mind putting that in the faq? Also, put in that corner combo ground crossup combo hint we gave earlier. I'll copy and paste it to make it easy.
How do I dash underneath a person when doing a corner combo with 3C?
You have to do 214D~C close enough to dash under...Also, you have to do the full dash as early as possible once the 214D~C is done (When the opponent is at peak of air before falling towards you). Once you do the full dash (which you need to get the animation of going under), find the right timing in when to input 5B. You don't even have to input 5B that early. What could be good for practice is to input it as slowly as you can and then go faster until you find the sweetspot. Train your muscle memory from there on out. Also, don't forget that it works best for Ragna/Bang sized characters and is much harder for Tager/Hakumen sized characters (albeit still possible).