Hello!
Nice combo bucklemyshoe. Good FRC timing.
But i think:
First combo: You need a keygrab in the end (at the place of Orb) cause Potem is a strong Character. He down so fast. And ABA is so high.
If you don't want a keygrab, use this: j.s, J.s, J.Hs and Orb (FRC and keygrab if you have tension ^^).
Second combo:
Try a J.hs if it doesn't work, keygrab ahaha. But try this: 2Hs, Danzaï (normal), when Potem is on the Ground, Danzai Ex (623 D) he is relaunch, dash in, j.S, J.Hs, Orb when is down, keygrab for safety.
Third combo:
I don't jnow. It is Ok for me.
Four combo:
Try a j.hs after second j.S that work on all big character except johnny.