we know. your players don't know what they want.
we know. your players are jerks.
Second, a lot of the tension is between players, as they really resent other people "not pulling their weight" rather than some objective standard of difficulty.
seriously, we keep telling you, there is no way to deal with those kind of players. you keep thinking that if you only find the right strategy, the right game, the right balance, then you can turn them in a wonderful group. but you can't. you can't fix the players by changing the game, no more than you can save a sinking ship by rearranging the furniture on deck.