Golden Hearts? Not really. Most Sith would probably disagree. Troubled beings yes, but stages of trouble, Raw, Focused and Uber Focused. To be dark side is to be in constant struggle with the Force, these categories represent what stages in that struggle Sith reach. Few Sith fully overcome the Force. The problem is that sometimes you have to be prepared to let go of power, and most Sith simply aren't prepared to do that.
no stages, dont make your fanfic a canon terminology.
and to SithKorisomething, dont remember name: most probably that Driod killed them all by Moff's order