I've been doing 2DD>22A>214D--or rather, I've been TRYING to do that. It's a tight window that works well in training mode but not so well in the thick of things. Either I screw up the timing or it looks like my 2DD has carried them too close so the spikes miss. Of course 6A must be faster and with better spacing. Duh. I'll give it a try later today.
And I also found out that the stick I was using doesn't register down right consistently, so half of my attempts at 3C were just coming out as 2C (Let's this be a lesson: always turn on inputs in training mode and check your stick, I guess.). Embarrassing to mode shift when you haven't done anything to warrant it. Makes me feel like a masher and a crummy player. Not being able to 3C had me so frustrated that I picked up Terumi, but now that I've got my own stick back, it's back to Nu.