Some groups just don't have the right stuff to do it. My first group failed and disbanded after many fruitless attempts, but my second group had people who were willing to give direction and people who were willing to listen. We got close to hitting the time limit on our final attempt. Not to mention, he was half a second away from completing an attack that would have wiped us again, but we got him.
Just keep at it. Teamwork is key
Our group had one tank and one healer on the cannons, the other healer healed the group, the other tank focused on the mobs, and the DPS alternated between boss and mobs, and we had a bard operating the harpoon. We all collaborated to ensure that the harpoon wouldn't miss. We did melee LB3 as soon as it was available, then burned the boss..
The person who organised us all got almost all of the commendations at the end, i got one too for some reason.
