The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
Premade Teams in the upcoming TMM 4 v 4 Queue
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First of all, this shouldn't be in this sub-forum, second of all the issue you are describing is very unlikely to exist because: There would actually need to be premade teams of people try-harding - right now this doesn't exist, maybe it will but I doubt that.
Another reason why this shouldn't be a problem is that if they do play better just because they are premade then they will get more rating and eventually it will balance out.
For now, I am locking this. If a mod wants to then this can be moved to General and unlocked but I don't really see a reason for this tbh.