don't charge TOO often cause that could fuck up your bnbs. ex. your 5b on a crouching opponent would turn into a 4b and whiff
also, charging too much will make you less mobile
that's pretty much it lol, although i could see j.c potentially hitting buuuuuuuut the hitbox is just too high. gotta be kinda low to hit that and by then your opponent would have already seen that crossup