Try to find his launchers. He has about 3 of them (Hold_3P) (6K) (Hold_6KH). Jacky's stuns allows him to be as creative as possible due to how much frame advantage he has on them. His weakest attack in terms of frame adv. is his 6H+K, and that move is +17 on fastest SE. This is why learning his FSK is so important. My advice to you is to practice it every single time you get on and..
Get out of your comfort zone and try using options you don't normally use because of your thoughts pertaining to the moves.
Jacky is a fantastic character. Good luck.