Originally Posted by
Gserpent
You should use a fast cast that gives you weave slots. This usually means either Sharpened Knife (highest potency) or Sonic Boom (lower potency but you can attack at range if needed.)
As others have said, you should be using White Wind to generate aggro. You will typically swiftcast a White Wind on the pull and this will lock you into the aggro lead. As long as you are weaving your Primal spells in between uses of Diamondback, Dragon Force, etc you should have no issues maintaining aggro. You do not need The Look.
You will generally not need two tanks for any content, though I think there are some raids that might use two tanks as an option. Getting in Blood Drains and Magic Hammer between Diamondback windows is typically enough to keep a single tank alive through almost anything. Avail can also be an option - it's effectively a reverse Cover (they take the damage for you.)
Note that you have absolutely no reason to use a tank morph for dungeons. You will typically run one healer and three DPS. The healer can go into Mighty Guard if the boss has powerful autoswings, but generally you can just Diamondback any tankbusters and be just fine. Normal mobs will die immediately to Ultravibration rotations. You might run Mighty Guard if you're doing a W2W but with four BLU, you can afford to just split each leg into two pulls.