Will the missions be symetrical? By that I mean will both sides have equal points and equal objectives?
Given that the objectives are drawn at the start of the game could they not be asymetric, one side gets more points but a harder victory condition to match?
I think there are a few good reasons to go asymetrical, as you then have more scope to provide more variety of mission. Also, the trun restriction or game length restrictoin could make the idea work better than playing a non-limited game where the out numbered side will just get a hiding.