you forgot [/QUOTE]. Just cosmetic things.

If you want to squeeze as much dps as you can out of that DRK, you would like to wait for slashing debuff and/or Trick Attack and/or MCH's debuff.
Thou using unmend > plunge is natural and absolutely fine.
Until Boss first attack is Cone AoE to the MT, then it's not advised to use plunge becuase of that 0.8 delay after usage.