With the exception of some annoying spam issues, such as the infamous Drake barrel, the game should stay as unbalanced as it is. As long as 1/4 the rooster is competitive, then its fine.
Why do I say this? Well, some people like to feel powerful and gravitate to stronger characters, while others like to play the underdog and get satisfaction when they win with a generally weaker character. The later is not possible with perfect balance, so let it be.