I one shot Violet Hold on heroic last night, and it was the quickest way to get badges for sure because it's like 20 minutes total in there. I don't know how to comment on strategy. All I did was turn on the resistance aura for whatever the boss was doing and just tank and spank and spam AOE heals, because honestly I had no idea what the real strats for the bosses are. On the final boss I also had to push backwards to move them out of him when he pulled them all in.