BC Turn 4 is somewhat old content for the top-tier players around here, but for my own improvement, I'd like to know how the best offtanks grab so much hate in so little time. In the groups I find myself in, we're usually finishing off the Phase 5 Knight and Soldier as the Phase 6 Knight, Soldier, and Spinner Rook appear. I try the usual tricks--saving IB and combo'd BB to use on the spawns, saving Provoke and Tomahawk for emergencies. But this isn't good enough--healers are getting destroyed, though it takes me only 8 seconds or so from the time of spawn to have everything on me.
I consider myself a tank of above-average skill and knowledge, so it's deflating to be the cause of wipes in Duty Finder. I'll admit to not knowing spawn locations very well on my first couple attempts, but I'm getting better there. I think I need to be using Flash more--maybe stand in the middle, Flash the first add, and stand near the healers for Overpower to grab the whole group as they swarm?