Altered Time - your #1 World of Warcraft Mage resource!

Is it worth considering using PoM on our crystal while Mark of Doom is up on either the boss or the crystal, in order to get an extra explosion, instead of at the end of our crystal to get an extra AB into the crystal?

From what I can see, the current racial weights are still using T17M, but since haste is much more important after the T18 4PC, wouldn't trolls and/or goblins become stronger races for Arcane Mages? Would be very interested to see the updated racial weights for T18.