Hm, that's pretty much how I started out too. Try b312 b312 f24 into Bicycle Kick. (you can do three b312's but you can't let them fall to low for f24 to land, actually...if you let them fall to low just trade f24 for b1 into Bicycle Kicks)
I wouldn't recommend EX Dragon Kick, as you can just dash block. EX Dragon Kick puts them out of pressure distance as well. (except in the corner)
As for mastery,
XBlades is the guy to talk about that. I don't have a clue.
He's zoning is great, but I think he's pressure game is stronger. IAFB's are hard to master, and can be ducked, so I wouldn't worry to much about it.
He's very easy to learn, but he needs to work harder in high level play. I'd recommend him to any and every beginner.