Lifesong, hello again!
One of my clan members had an idea that they gave me after this last war. Like you I have a large clan, over 60 members and find it difficult to manage the activity as you said above. What the idea is, is to take a screen shot of the clan's stats from the barracks tab in game. take one before and after the war, and see who had an increase in games played during the week, thus seeing who is active. Just an idea.
Thanks