I usually use 9j.lk when I initiate it because I'm usually half a character length away from using lights to set it up on most characters. When close up on the medium to tall crouching chars, I use 7j.lk (usually after a d.mp that isn't pushblocked or after an IOH to do another one).
BB Hood is in those class of characters where it's doable, but kinda difficult. Her and pretty much anyone else that can just crouch under Fish stand lights are the same way for me. I think it's nearly impossible to do it using 7j.lk in most situations on them.