I think we’ve all run into situations where we get stuck trying to finish the friend campaigns. I realize the obvious answer is “Well, make your toons stronger…duh.” I would like to propose another way to compensate for not having all the toons quite up to par:
Make is so that every friend level above 10 gives the members of the team 1 of those little fire bonus things like for invasion. So if you get stuck, well then you can try to run time based missions to boost the friend level. Then when you reach 11, you get +1 flame boost. At 12, you get +2, and so on up to +5 at friend level 15.