In order to 4PP 6PK, you must free cancel after 4PP. Free canceling is when you quickly hit the block button right after an input so that your character doesn't finish the string.
Thanks @eks2009 ! Hey everybody!! Nunchaku_101 from PSN (AKA MutenRoshi93 from Xbox) here. I can all ready see that we have some in depth discussions about J Lee. Can't wait to learn and grow in this community with you guys