It didn’t work because fireteams of 6 would get matched with other teams of 6. (Making no difference)
Make the limit 7, per team color and fireteam.
that way if you have a full team you can’t get paired with other large parties.
As a solo player, hearing 6 man won’t mean two different fireteams paired together (12 man still) vs you and 11 randoms.
Games where you call out the air, nobody uses a mic.
And even the best tactics do little to help the guaranteed to lose side.