Interesting perspective on clan leader's theoretical practice. I don't think my theory of clan leadership is that cut and dried. However, if you condense the points to a main point, that might be it. These are items you failed to account for; the reason being that currently you have a dedicated and co-operative team of players. When players become board or broke, or dead; teams tend to be in a constant recruiting mode looking for players that won't time out or throw games that are winnable, leaving it difficult to recover lost points. (I have lost hundreds of net points this year alone to this unfortunate reality)
It is unfortunate as well that "a large portion of the chess playing world is aging", may not be an accurate assessment but for the online chess world (more specific: the subscribing world of this site and the ability to play clan games) - appears to be people who actually can afford to pay the subscription. That appears to be older people. What happens to older people when they get older? Doctors, hospital stays, extended vacations, dementia, dead; can throw complications into any clan leaders plans. Please don't take that as insensitive but as a consequence of life.
The Be Happy Clan has been on the first page all year hovering from 4-9th all year. It has not been easy, but necessary for some players to play dozens of clan games, myself over 50 always. Yes, I do manipulate the ends as much as I need to not drop in page order if possible, (don't resign a game that looses points with 2 weeks on the clock or have another challenge points winning to offset the loss) is an example. It may not be ethical or compassionate. It is good business to reward my team with the status of as high a score as I can achieve without cheating. The clans you are talking about as abusers are just better at staying on top. I think they do take it to the extreme, but I am doubtful that the sheer act of artificial ratings can stop a good clan leaders analysis.
I think the method you discuss is not as much of an obstacle to experienced clan leaders because rating history is available as is games of your team. If the match is not good for you (or fair), delete it, decline it, resubmit it, or quit. You are the clan leader and you have to either rally your team to put out, or except the outcome. Or, make an adjustment in your analysis to compensate for the abuse.