been testing this in training mode and it seems that a meaty 5c catches the opponent if the try to forward roll, guarantees a 63214c followup and at certain ranges gets you 6c after the meaty 5c.
also got a lil gimmick for forward roll. if you think they will forward roll you can also dash after knockdown, you will end up on the other side of them. if they did tech forward i do 5c and it will usually catch a poke from them or hit cuz they dont expect you to be on that side of them.
of course i dont see either of these working well with steins on wake up, but if your opponent knows that thats how you beat stein oki you might be able to catch them doing something stupid every once in a while
EDIT: found that after the wallbounce of 6c if you set a stein it gives you almost perfect timing to hit them with a meaty 5c , which if the distance is right( which it should be off this set up) you can get 6c follow up which should set them up for this all over again.