I've played creepside some and I know its tough atm. Having played it, I agree that it's tough against freep groups. Recently, for freep groups that I'm leading, I've been limiting number of players in them. Opening and closing the group as it seems creeps are ebbing and flowing.
Recently I've seen Lifepreserver leading groups, but it seems like lp is one of the few that does it. I've always wondered why creeps don't want to group up. I realize that there may be a 2 boxer, but the same can happen against freep groups as well.
If anyone has constructive advice about freep groups, please give me a holler in game (don't normally check out forums).