I don feel that the Drama Point amounts balance things out between White Hats and Heroes (particularly Slayers). Any other solutions?
The bottom line is that White Hats cannot be balanced with Heroes. That would distort reality as seen on the BtVS TV show. They can get specialties that out strip what a Hero (particularly one concentrated on combat) can do. They can also be more profligate with their Drama Points as they regain them faster. The design intention behind the BtVS RPG was to make White Hats fun to play, despite the fact that they were not balanced against Heroes. The playtesters seemed to think we accomplished that. If your gaming crew feels differently, I recommend that they all play Heroes or Experienced Heroes.