dunno if this was discussed, but when using st.D, the answer against it is for the opponent to use a crouching mid attack. ala cr.A, cr.C.
so just going nuts with st.D will get you killed against a good player.
but the answer against that?
i think the best ones are st.B and qcb+B.
st.B you can just throw out ff+A and hope it connects.
qcb+B you can link into D flashkick in the corner (gotta space this kinda far to not get stuffed)