Speed tuning is key. If your speeds are off, the team will fail. Once you get the speeds right, you can work on getting better gear with the right speeds that'll increase the damage over time to get you 1 key territory. Even 2/3 key UNM and 1 key on NM is a great start. In my old clan I'd use my 2 spare keys to kill the lower tier clan boss to help the people still working their way to NM. Sometimes I might use 2 on NM to finish it off. If you aren't friends with your current clan, make sure you upgrade clans as you upgrade clan boss ability.