Counter hit usually extend the untechable time of hits. I can't really say you should think of ryuujin as an ender, but off a CH and the correct position you probably could do something like 66 > 2H > and 6HH, which then wallstick and then do more damage.
Off or a regular hit, well, Here's what I think you should do:
Look at the frame data, and go down to the Gatling (revolver action) table. Play with Jam's gatlings. Those are combos if they hit!
Now you have combos. Now, just throw in special moves, and now you get different things happening.
Ryuujin has a fair amount of risk involved, but it's very useful for punishing people that hang out in the air too much trying to control space on you. Don't use it too much (as well, don't use 6HH too much, even though it's godlike), as it's very punishable, even if you TK it.
The good news is it's incredibly useful on hit. But I think you should start with her gatlings first.