I just figured out how to do Ippatsu combos from a throw.
Corner okizeme:
6Throw Haku RiichiA IppatsuA (char specific) drop rising jC jc j[D] ]D[ falling jC 6C tsubame 6C 3C
(char specific)
(AC) Ragna, Litchi, Hakumen
(BC) Jin, Noel, Nu, Rachael
(CC) Taokaka, Bang, Arakune
Timing is haku RiichiA ASAP, IppatsuA delayed as long as possible, second staff strike immediately after (small delay if its an A). Easiest on Hakumen, very difficult on Rachael, and easier than the typical Nu/Jin/Noel Ippatsu combo on everyone else. Hitting the first Ippatsu as low as possible helps to hit the C strike as low as possible. Noel and Tao tend to be able to tech out if the jC hits too high. If the character has a timing quirk on the usual Ippatsu combo, it'll generally stay here as well (i.e. Bang needs the first 6C delayed a little).
Rachael is a bit of a special case. ACC will always hit, ABC hits if you delay the A a bit, and AAC hits when the first A is delayed even more. ABC has given me the best luck, but I'm not sure which set is best. She doesn't fall as fast as the others which is part of the reason she's so difficult to land this on. Its probably just a timing quirk I haven't figured out yet.
This combo does about 3.8k.