Been playing H-Sion in the demo...this is the best shit I could find with her
confirm>5C,(5A,6AA,214B,dash,2B,5B,5C)x2, (5A,6A,2C,3C,623A(2 hits),214C,wait,2B,5B,5C)x2 5A6A,2C, HARD KNOCKDOWN.
Normally just do 1 214C and don't bother with the second, only a bit more damage.
If you do 214A after a long combo it doesn't hard knockdown, I didn't really play her in the PS2 version and don't feel like booting it up to check exactly how it works but it sounded like before after a long combo 214 would whiff and that it always caused hard knockdown, now if done to late you can tech out of it it seems to be about the same combos work to get the hard knockdown but now 2C appears to hard knockdown too which there wasn't a huge flashing label on the wiki about 2C being a hard knockdown that lasts for a while but there ya go.
So from what I know the old cutting sync combos on the wiki work, been messing around with getting a bit more damage out of them with adding in 623A before cutting sync, but doing this prevents a 214B from what I can tell...but you can 2C3C,623A,421C,214A,land,2C5C3C,421C,214A,land,214B
I don't see a mention of it anywhere in the wiki but air to air counter hit 623A(2hits),214C is a great way to confirm off air to airs if you don't have time to 214B or 214C immediately.