+10 item levels is a lot! So much infarct that Gorefiend didn't seem all that hard. Once we were able to control the mechanics the dps and healing requirement were kind of easy to meet. So after a couple of raid nights the boss that earned the reputation of "Guildbreaker of tier 18", went down.
I guess we also need to mention Killrogg Deadeye. A boss we sucked really hard on, and it took us way too long to kill. But we obviously killed him a couple of weeks back, just before valorpoints were re-introduced with patch 6.2.3