so recently someone on another forum suggested this (in or near the corner):
623D>66>6C>6D>632146D>623B>623A
this will do 6600 damage, but you need to land the first dp near the corner for it to work (and have the meter). it's much easier however to land it off a special cancelable move (6A, 5B, etc) or a freeze. the problem being that this causes the damage to prorate down to around 4500. however supposedly 623D can reset the proration so that it's as if you had simply started with it. is that possible?
edit: supposedly it has a very small window of opportunity to land it right