I'm not a tank, but my secondary is an Arcanist, and I've been using my Topaz Carb in the first three dungeons grinding. And yesterday in Copperbell, I was told by my tank to switch to the Emerald Carb and I didn't understand why. I did as told because he was doing a good job setting marks and building hate so I figured he knew what he was doing, and thought it was just his personal preference. But this thread has given me the "a-HAH!" I needed.
Thanks for explaining it. This is a great thread