I'm one of Hysteria and me and my guildies constantly run one or two groups premades. If we wind up in seperate bgs, we still try to lead rest of the randoms to do more bg objectives than just pvping pointlessly. At least, we're trying and it's paying off well actually. Because, as a guild, we have 94.25% win rate over 1400 bgs played.
As for rateds, just reach to me, Cheerleader, Stronky or Ready ingame. We still lack a lot of numbers in specific classes but maybe we can manage to arrange somth. for the near future.
Peace.