This is the JC combo I use, I've landed it in VS matches against some buddies of mine several times. Particularly if you're against Scorpion or Mileena and block a teleport punch or roll.
http://www.youtube.com/watch?v=fAEUdNLolnM
it's not dramatically different from DCP's juggle combo, just instead of using the Square, Square Jabs, I use Triangle, Square as it's a bit more damage.
13 Hits 34%. If you start the combo with the Forward Circle pop up instead of the Ax Kick (back X) it's actually around 37% damage.