Corner Combo 50% HP 100% HG Corner - 6C>6B>j.214D>66>6C>CT>2C>6C>OD>6C>6D>6B>j.214C>66>5C>623B>6321456C 7.8k Damage. Though depending on the character you are able to walk closer and connect 5C>623B to allow the special to add on the damage to break 7.8k. If you can't connect the 5C>623B from walking up you have to 66 to connect the two but it still totals to 7.6k. Not sure if this combo has been added but I found it messing around. This works off of 6C Counter or Non-Counter.
The combo above does 7,852 damage. There is a way to get 7,865 damage out of it but I find it a little more difficult in terms of connecting the 6B and CT.
6C>214B>5C>2C>6C>CT>6C>6B>j.214D>66>2C>6C>OD>6C>6D>6B>j.214C>66(if needed)>623B>6321456C (7,865). If you can just walk forward slightly and do the 623B so you can connect more of 6321456C