If you're not at full health when you pull, and the druid has HoT's on you rolling, when you pull you have to do direct damage to keep enough hate on them.
If you're pulling with a ranged weapon that misses or does less damage than the heals are doing to you (cut in half and -30%) then the one mob you targeted out of the pack of mobs is going to run after the healer. I'm assuming that because it's a druid healer they are casting Thorns on you. That means each time a non-main target hits you, because you have reverberated damage, you now have threat on them and a threat list is created. But because Thorns does so little damage, if you're not AOE tanking or tab-sundering targets that aren't the main kill, they're going to pull off and run for the rest of the group - which is likely the healer.
bsgnitro wrote:
Is there something I can do better to hold more aggro on the other mobs? I want to get this figured out.
On your warrior, thunderclap and tab sunder targets, if you don't already hit the "V" key in game to show enemy health bars above their heads so your hot keyed abilities (i.e. Sunder on "1" Shield Bash on "2" etc) you can click on their health bar, hit the button and click back, boom aoe aggro.
It's the same for druid and paladin for their respective aoe abilities.
I've noticed also while I've been tanking as a druid in these new dungeons, that I'm only ever on the main target for a couple seconds at the most, one mangle, one maul, one lacerate then I switch targets to the non main kill targets to gather threat before the dps in the group switches. That way a lone mob won't charge my group members when the main kill is done and I haven't spent enough time on the others.