The first injustice is lighter green head group. This is much slower and difficult to kill than the other 2, which gives this group a huge advantage over the other, between harm reduction and the resurrection of the invocations is so hard that people avoid attack green base.
Moreover, we must regulate the amount of people in one color and another, there is clearly much more populated servers than others, if by chance playing more servers populous and active in mvm other servers are too intimidated being boring or loss time playing these games when you have such luck. I suggest that there is a balance in this, so that there is in each group highly populated servers, media servers population and low population servers.