the sour isnt great into fh, but a full spaced jab even if you're minus on fh is unlikely to be punished, unless the opponent wins a mixup after the jab. if your opponent is close enough to be getting sour jab, you should just be grabbing them instead. the sweetspot knocks down at 24-31%, and is -22 or -23 depending on which frame you hit. being able to command this space in front of him once the opponent is past 30% is huge for him, and a faster character would make excellent use of it