First of all, when i exit the ebon hawk on any plant, i make a save on slot 2. When i save further in the game, i save on slot 1, so if i do something wrong i can still load slot 2 and start all over on that planet again
Did you poisoned both the characters, before going to the final test? this makes your enemy weak and easy to defeat. try to run from them so they can't hit you and use your force powers against them like force wave and lightning

and if that doesn't work start over again with a modified saved game like i do.
~Khiru