Balancing of colonies

I think the most important thing to making this game as great as it can be is a proper balancing of the colonies. I think they are pretty balanced for the most part but I feel a scientist has a slight edge robot and expansive are about even and a scavenger is at a slight disadvantage. What does everyone else think? Are there any suggestions of bonuses that can be implemented or taken away to balance the colonies better? My personal opinion is that if you take away the scientists' ability of taking less damage from the black market that would take away their slight advantage and at the same time take away the scavengers' slight disadvantage. Any thoughts?