The problem with balancing team games is four-fold:
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Organized teams are superior to randomly-assigned teams. That is, a team of familiar players using Discord more often beats a team of randoms of the same Elo.
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A team of players that are highly-practiced on a specific map more often beats a team of the same rating with less experience on that specific map.
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A team with a smurf of greater skill than their Elo indicates more often beats a team with accurate Elo.
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A team with significant spread in player Elo cannot be compared to a team with even Elo using a mathematical average. A different formula must be considered. That is, teams of Viper, 1000, 1000, your mom more often beats 1000, 1000, 1000, 1000.
The more these factors are considered, the closer the matches can be consider balanced.