Idk if this is possible but maybe a committee made up of people who have played the game since the old gen ages that can accurately (as accurate as humanly possible in a situation like this) determine which players should be put together. As an example, 3 people from the LG community, 3 people from the 3eVolt community, 3 people from the 93rd community, 3 people from the USMC community, etc. And yes this might be a stupid idea but I'm just brainstorming how to make this more balanced.