if u r going for a charged C+D most times it will be blocked… so u should cancel it into qcf+B since u can do 2B, 2A, 2A into a hit confirmed DM or just 6B if u don’t have the bar… or if u r sure it will be blocked… u can do qcf+B into D, C+D xx whatever…
duo lon in xii is very badly nerfed from xi… so constantly trying to pressure is going to get u killed… u gotta sorta play like dhalsim… stay away and annoy them… duo’s damage output is pretty crappy… so once u annoy them enough with 6A and 6B and air 6A and 6B air 6B combos with 6A or 6B from miles away u can get them to open up a bit… so in the middle of all that close the distance from time to time using qcf+B or hyper hop 6B, and quick low combos like 2B, 2A, 2A. 6A or 6B and hop B or D, C, qcf+C, qcf+C, qcf+B, 2A will net u some good damage… and often u will have meter and whenever u do use it in combos…
also quick strings like 2B, 2A xx qcf+B will let u mix-up cross-up attempts depending on how u do it… and i find that he also heavily relies on his throw as after certain blocked strings into qcf+B lets u pressure the opponent and thus setup his throw easily… also try to land a CC in every round if possible… it cuts down the amount of work u have to do which is a whole lot by half…