(Credits for the combo and tips from Ultimate Despair in TA)
You have the include in a true combo every Drive attack of Tsubaki, the combo in question is this:
↓↙←↓↙←D + ←↓↙D + ↓↘→D + →↓↘D + Air↓↙←D + ↓↙←D + ↓↓D
Make sure you put the command fast enough, in the →↓↘D part, delay the last hit ↓↓D holding it or the move will just miss. You can really use any character as the dummy, I used Makoto and the combo works fine, start in the corner and start ↓↙←↓↙←D whenever you want, I used it in front of the opponent, but I think its works in any position. Just be patient and practice until the combo works. Also, you can build bar making Perfects Shield, blocking in the same frame the hit will hit you. Good luck!