Edit: Whoops, you guys are talking about something completely different. Sorry about that! Anyway, I’ve found out the trick for hitting the j:h:, st:h: part, and it is definitely not easy. It is still based on delaying, though. In order to make the j:h: hit, the enemy must be just above chun-li’s head her j:h: hits. This is not as easy to do as it sounds because of the way her j:h: moves the enemy in the direction that SHE is moving. Because of this, a simple st.:l:, st:m:, st:h:, cr:h:, stomp, airdash, j:h:, st:h: will not work because the j:h: will push the enemy downwards towards the ground and make them recover before the st:h: hits.
BUT, if you use a kikoanken, then the crumple status will make any further attacks cause the enemy to go airborne, and will allow a sufficiently delayed j:h: to st:h: to land. The biggest worry is delaying too long and whiffing the j:h:, but with enough practice, it becomes easy.
Here is the combo I’m currently using to get a 75% success rate on this combo:
st:l:, st:m:, st:h:, Kikoanken, st:h:, cr:h:, stomp, instant airdash, delay to let chun-li fall below the enemy, j:h:, st:h:
It is a bit more difficult to incorporate a :f::h: into the combo, but I’ve been able to do that a, too. If you want to know how, read on.
I’ve had this problem for a while, but I have found a way to extend the combo a bit. The trick is in delaying chun’s standing and crouching :h:s. After the kikoanken, you can hit the enemy with :f::h:, st.:h:, cr.:h:, but you’ll notice that the enemy is quite a bit high in the air. It’s this elevation that causes the st:h: to whiff further in the combo. By letting the enemy fall a bit before hitting them with the cr.:h:, you will prevent the whiff later in the combo. This tactic of delay can be applied to a few of her other combos which end in cr.:h:, :s:, since sometimes chun-li can launch the enemy too high to get a proper air combo on.
Also, all of Chun’s :h:'s cause a massive amount of hit stun on the opponent, so you can delay these attacks for much longer than you might think (except her :f::h:).