the way i learned it was. do this combo: 5b, 5c, 5d, HF, follow up.
make sure to input the hf as fast as possible after the second hit. note the timing. now run dash at that timing. it should work.
it was quite a moment of stupidity, as i had been using the above combo, as a nooby BnB(still do for that matter as i still am a noob)
if you didnt read earlier on some chars with the combo you listed, you actually have to super jump to get all the hits on them.