I think the ship shuffling could do some good. It might not be used by all stacked teams, and it might as well be used for trolling, but in either case the loosing side has got the option to request shuffling. Making a statement for "Hey, let's make this more balanced" by simply clicking a button. That would at least give players who have bad luck with their own crew and stacked teams on the other side some "support".
They don't have to leave automatically or try to talk the level 10 crew on the other side into shuffling, they just press a button and the other team sees the request. I'm sure there'd be some moral imperative behind that, and I'm also sure that accepting such shuffles would be well received by all parties in the game.