There have been a lot of ideas and maybe mine isn't new. Just handicap each battle. Instead of just stars, award points based on a handicap factoring the strength of each. This would curb sandbagging and encourage more age variety in war.
These fools having seemingly infinite planes, make horrible attacks, but get 5* anyway. They've been reported multiple times by my alliance and we get the usual, "replays are not always accurate" BS. COME ON!