I’ve found a way to do more solid meterless damage off cross-up tatsu. It’s spacing dependant however.
If the positioning on hitting them with the cross-up tatsu is right, you can step forward just a little and get close stand HP into a fully connected HP Shoryu after tatsu, far HK. This does a touch over 300 damage.
To get the positioning for this, you should line up the cross-tatsu in a way where it just crosses over and hits close to them at the last moment. This can be done with earlier HK tatsu’s from further out distances, or with MK tatsu’s at closer ranges. When done this way, the cross tatsu should be able to hit crouching characters such as Ryu.
Once it connects, do the HK nice and early to get some elevation, and you should be able to step in and do it as a match combo.
You can also step forward slightly and do cr.MK to HP Shoryu. This can be done from more lenient spacings. You can get 2 or 3 hits of the Shoryu depending on how it was lined up. The 2 hit Shoryu is worth about 260 damage total, and 3 hit Shoryu is worth about 280. You may accidentally cancel into the demon flip, but this isn’t a terrible outcome.
Also, for any who weren’t aware, you can go from Akuma’s basic tatsu staple juggle into teams super for some mean damage should the option take your fancy. So any old BnB stuff into the LK tatsu, then fierce into team super.
I do this with Kazuya, and the damage for far HK, close stand HP, LK tatsu, close stand HP, Team Super is 582, excluding gems.
As a reminder of something I’ve said earlier on this forum, you can do cross tatsu, HK, cr.MK, team super. 515 with my team.