I think of a possibility that can take advantage of the auto balance settings in a 5 days evacuation mode, given that all the players have almost same skill level.
First, one team will lose the first 2 matches on purpose, so that the team can get the 2 points stat buff from the auto balance.
Then starting from 3rd match, the team can start winning the match by having the 2 points stat buff.
4th match, the team still have one point stat buff with the environment effect by winning 3rd match.
Finally the defend mode, the team will get the final buff which increases winning percentage a lot.
I got the idea when I was watching the video in Evolve official youtube channel here (check time 21:27)
The environment buff for the 3rd match not really matters a lot, because the more birds effect in a rescue mode doesn’t help hunters.