to clarify the basic route for "jump back exploit"

1. Start the round blocking, hope for a projectile or jump kick to take a single hit
2. If they jump kicked you and you blocked it .. immediately jump back and press kick shortly after you leave the ground .. so you fling back and kick the air
3. If they did a projectile or anything else ... crouch and wait until they walk to about sweep distance and do the same thing
4. Assuming you did 2 or 3 correctly .. they will pause .. and then jump forward with no attack .. they are completely open for anything you want to do to them

For the Jax Backbreaker: The route from there is to jump forward kick into them, then press block to backbreaker immediately as the JK hits

For Reptile SNES/No HPT at this point I would do a Force Ball then uppercut or in some cases roundhouse at the moment they land then force ball at long distance .. while blocking the projectile they throw back

also remember the distance required in which you jump back is the most precise component and the easiest thing to mess up. if you jump back without kicking .. the AI will actually still jump forward and do nothing .. but they will do so immediately. Depending on the situation/route this can actually be a good thing as it saves time .. but its harder and there are situations where it just messes everything up