You can CC infinite with j.RH or vertical j.RH. Both her j.RH’s pop the opponent up far enough if they hit twice that you can use another attack (like j.FP) to keep them at the height you want. I would recommend [j.RH, j.FP, j.FP]xN, or whatever variation you’re comfortable with. You just need to get the hang of j.HK.
Headstomping in the corner forces Chun away from the corner, which is probably why you can only get one headstomp off. The repeated headstomps only works midscreen. However, there is a way for both Player 1 Chun and Player 2 Chun to loop headstomps for an infinite CC.
For Player 2 Chun it’s a simple matter of crossing up in the corner with j.SK, then stomping across the screen to the other side and repeating the process.
For Player 1 Chun it’s a little harder. But, it’s possible to jump toward the corner, then immediately wall jump out of the corner and hit with j.SK as soon as you leave the wall. Because Chun is facing out of the corner, the j.SK pushes the opponent out of the corner as well, and you can loop more headstomps.
An example of the Player 1 headstomp infinite is like :
[j.FP]x2, j.RH, jump toward corner, wallbounce -> j.SK, CC [j.d+FK]xN, late j.FP as you’re landing, repeat.
The more accurately you time the stomps, the more hits you can get. It’s also dependant on your position relative to your opponent’s body. But, it’s a whole lot easier to just stomp a few times, since if you stomp a whole bunch of a lot then you’re going to get really high in the air, which makes landing more hits difficult…
I’ll try to get Chun finished next so that you guys can see what I’m talking about.