Instead of falling straight to the ground for the low mix-up, you can do an empty air dash:
falling j.[D] > AD~]D[ > Land > 2B > 5B > [M] 2C > combo
It's quite slow though.
EDIT:
I cannot do, for the life of me, the staff in corner combos.
I always fuck up on the 2jB jHatsu > Haku part. 2jB always misses and when it does it, it's too high for Haku to connect after jHatsu.
Any tips?