Geez, I haven’t found a reason to post on SRK in awhile, but hopefully this helps you guys out because I just started landing this consistently.
So firstly, the crossup tatsu I prefer to use the LK version. HK seems to knock the body away slightly farther/faster and I’m not sure but the recovery may be longer? I’m not a frame data guy. I time it based off of anticipating Oni’s sound when he does the move. He makes a sound like hooo-wah when you do his air tatsu. When he utters the second syllable, is when his leg will be on the left side of his body(P1 Side obv.). So I got the timing down by just listening to that sound and timing my jumps around it. It’s slightly after he begins to descend. Just to clarify: the Hoo is his first hittable box with the kick, and the wah is the start of the second. Hopefully I’m not explaining this like an idiot.
The super shortcut doesn’t seem to work for me when I need to IAS this fast. It could be erroneous execution on my part, but it usually doesn’t persist this long. For whatever reason i need to hit the HP slightly after the rest of the inputs to get it out on time. I also buffer the punches as I land and time it so as soon as I’m able to jump is when the input should come out, which I’m sure you guys are doing already.
If your supers are coming out on the ground: Slow down your inputs and try delaying the HP.
If your supers aren’t coming out and you’re just jumping you’ve got to be faster.
Hope this helps. This character is crazy fun once you can hold the super over your opponents head. It takes away so many options.