We talked about this. I told you what i think and you kinda summed it up in your op. I and many others have specced the guys numerous times and for hours long. They are extremely good teamplayers. Use their own TS and play tactical.
That being said; I can name only one where i think maybe something is off.... The others are totally legit players imo. I can`t ban them, like you said yourself, because i have no evidence against them. If they would appeal, they will defenatly win, because of the no evidence.
We have a couple of options; Ask them not to play this well, but we all know that`s not going to work. I can however split them up, so that they are not together in a squad, or better team. I`ve seen a couple ragequit already because of that. People got used to the ZONK guys, there is less whining in chat now. People, other then you, don`t stay away because of them. If that would be the case, the only thing we can do is ban them for being disruptive to the server. So for now i will only split them up, and hope they eventually leave because of that.