Cichlids kept in large groups are so distracted by all the other fish that no one fish gets picked on, I agree that overstocking can be used to disperse aggression. But when all of those fish reach their potential sizes in a year or two, they won't even be able to swim without bumping into each other. Filter size does nothing to remove ammonia from the water, it just provides more room for bio bacteria to break waste down from ammonia to nitrates. The nitrates stay in the water until removed from water change. When those fish are full size, you would need to be doing something like 75% WC's daily to keep nitrates below harmful levels.
As I said, to each there own... but in the long run if you intend to keep all these fish in the tank, these fish won't live healthy lives. If you actually do research from people who know what they are talking about, nobody would ever recommend living conditions like this. It's actually pretty cruel. Not trying to come at you, just hoping to convince you to re-evaluate your strategy.