the key to the combo (well how i see it) is doint the j.S asap after the IAD. (actually i cant really put this combo to work and i dont really try it much...)
also i find 2HS > IAD j.D 41236S > 669 j.S j.HS j.D 41236S easier and doing more dmg aka better.
also 2HS > late j.HS j.D 41236S (the things is light character will be very low after this setup, you can either do double keystab or go on and do 2 more loops (j.S, j.HS, j.D, orbs) for damage. > Keystab > OTG (wont work on heavies cause they wall to fast).
try 5S 2S 421HS RC 41236S (thou sometimes hard for me to make it work on heavies) very good dmging setup with many options to pull of after orbs.