I'll answer witht eh same answer I give to any alignment system (or list in general) that contains purely negative terms: That's something bound to create onesided-ness.
Your system is already good at kicking out most "this can only be evil" alignments, but Tyranny (and in the extented version, killing and hate) is just evil. One of the definitions of Tyranny is "cruel and oppressive government or rule". A more fitting name could be "Domination" or "Overpower".
Otherwise, as already said, the gird is pefectly usable for villains and heroes. Different alignments might (or even should) clash with each other, but there's no clear good or evil.