Horokei, you have to redo that list
I know for a fact (and tested it just now) that on Ino, Anji this should always work. I tested it quickly again on Millia, Ino, Anji, HOS. Except HOS I was able to do both on 1 block and not blocking crouch (3). I was also holding 1 or 3 the whole time to avoid anything fuzzy.
Set up used was into corner throw, IAD j2S.
I believe the problem you had for missing is because you didnt hit with the bottom hitbox of j2S. Probably by the time you could hit opponent sprite, only front part of j2S was left active. Or you didnt IAD low enough :D