Iprep is good, but as I said the prep itself sucks. Sure prepA will catch steppers and prepB will beat buttons, but you are not supposed to do any of that: if Raphael does A just high crush his AB, worse case scenario he does AA, you get hit for like no damage and his pressure is over. Similarly if Raphael does B just step to his left after BB: if he does BBA you get hit for nothing and his pressure is done, if he does BBB or BB(hold) you punish him with a full combo.
Worse case scenario if you respect his iprep too much, Raphael can SE off of it and mix you up, but to do that he needs to read you doing absolutely nothing. Which honestly unless he got in prep with 66B+K, which is very plus, that's quite the hard read.
Anyway I'm an Azwel player, poor me. While you play... Taki?