Welcome

EntropyEnjoyer, welcome to Zero-K and the club. I also enjoy small team matches more than the big Teams All Welcome (TAW) lobby. The community has unfortunately not yet substantially grown to support more than one teams lobby regularly. I, for one, think that "measures" are necessary, but some are saying more marketing is necessary to grow past this point, and they are probably right. It would help Zero-K a lot if a streamer would play it.
I agree that you should play ranked 1v1, because it's easier to find matches and it gives you a good training for what is good in small team matches. I believe with some practice and the desire to do it, it's achievable to join Palladium. It sucks that the small team games is gated by rating, but it's necessary to have reasonable balancing.
During some hours the TAW lobby is small and you can get some small teams matches there, but don't expect the players to play good, as TAW reinforces bad play.