Delay your gatlings as long as possible, j.B...C...B. If you aren't in the corner you should dash jump (669) everytime you land.
As I mentioned in the other thread, you want to treat Hatsu > RiichiA like one fluid motion. As soon as you finish inputting Hatsu (236B) you should already be circling back around for RiichiA (63214A), you should be finished and able to press A to execute the move when Hatsu hits.