close HK CH > step kick > close FP > HP COD > FADC > step kick > close FP > HP COD > FADC > close HP (should stun here) > ultra
i think to combo into step kick from the HK the opponent has to be crouching, and step kick to close FP doesnt hit all opponents crouched. If it doesn’t work on seth forgive me, but If it does, this combo might be close to what you need.
edit : this same combo should stun Akuma as well, if both hits of the last close HP hit, should total 850 stun. not sure if you can step kick close FP him when he is crouched.
edit 2: close HK CH > step kick > close FP > HP COD > FADC > step kick > close FP > HP COD > FADC > crouch HP > wheel kick (stun) this should be 1000 stun. Might open this up to more characters.
that combo will only do about 430 damage and probably won’t stun. I tried finding 100% stuns on Seth as Abel and he doesn’t have any. I don’t think Abel can compete for this one