I am no beta tester, so I can only speak from what I see on youtube videos and streams, however, from what I do see, my opinion is that the matchmaker has yet to have the appropriate number of players to work properly, I do often see on streams matches with only one carrier, or 2 carriers, but one is 2 tiers higher than the other, now, if the matchmaker in WoWs works the same way as in WoT, the player number might be the issue, perhaps, and this is a big perhaps, when the OBT starts, the matchmaking will start to make a more even setup of teams.
About the carrier setups, I can not speak because I don't know. With that said, when OBT start, I very much look foward to play CVs as I really enjoy a good hard RTS.