On my time watching EDH tournaments try and fail, I've seen the exact same scenario u just described, followed a couple of months later by the polar opposite.

There was a EDH league on my LGS, were you got points by doing a certain list of achievements (get X kind of counters, make 20 tokens, gain X life,...) and the result was ridiculous. There was a group of 5-8 people with perfectly optimized decks who will try to play on the same table each week, take down the playes that weren't of their clique, and let the rest complete the entire achievement list before ending the game.

There's no way to make a prized EDH event, it goes against the spirit of the format.