You really have to DELAY the 5C after 2C to end the combo. I keep forgetting.
I'm getting it, but still dropping it a lot too. Invalid airthrows that are too high and missed 214As abound. I'm actually getting the positioning for superjump, but realizing that it's not consistent for each combo, but related to how high you throw, so...
I still find it hard to land the backdash j.C, but now it's because I'm backdashing too early and not because I'm positioned badly, so progress.
Also I played like 6-7 games with my friend's Hisui today and didn't lose with Satsuki at all, but it's not because I'm so much better that he's just off today. He was not being nearly as aggressive in getting out of blocking as he usually is and it was fairly easy to break his block whereas usually I end up eating pokes while trying to put together a blockstring and getting comboed for free. And of course getting easy wins says nothing about how far I've come.
I do find it interesting how Satsuki has, not necessarily the hardest in terms of executing it, but most strict BnBs in the game. The timing on a lot of stuff is strict, like generally hitting whatever attack you use to OTG too early will cause it not to register at all, then when you realize it it's too late to hit them, whereas a lot of BnBs have pretty loose timing, and the fact that it's so integral and the last part is probably the hardest to time. Mistime the last part and you lose the 4-way mixup, and that's a HUGE loss. And unlike Ciel, whose hardest part of her BnB is the 5CC cancel in the beginning/middle of it and getting them into the air means it's much harder to screw up, Satsuki's BnB is easiest to screw up right at the end. I do find it a lot of fun learning her though, so I'm not complaining.