I love Carl's DDs <3
I also love using Fermata if I reset my 6D loop with 6C, it seems to be the most optimal use for me right now, unless I can catch my opponent in the air with a throw and they throw reject. Then I can UB Fermata them.
5B>2B>3C>Big Bang Upper>Insert Follow Up Combo Of Choice Here.
Also regarding switching to a stick. I bitched and moaned for weeks when I first got mine, but then EVERY single time I turned Blazblue on, I did Carl's 9th Challenge, and made sure I completed it once before I did anything else. Lo and Behold, I mastered my stick within 5 days. :O maybe that'll help you.