How about having clan wars sorted into leagues same as individual players. New clans start at bronze 3. If you win a war you go up a league, lose you go down. Machmaking is against a clan with same numbers in same league instead of similar strength. You would quickly get sorted into a league with others who score similarly and have fairer wars. How many stars you score is a better indication of clan strength anyway. Players who dont want to participate in wars wont have such a big effect as it will have already taken effect on what league you are in.
Bigger win bonus the higher the league as incentive to go through the leagues.



