If you still have your T20, make sure you sim it. It is less reliant on CoF, so your cooldowns can line up better and feels nicer while using Scourgewing or Forgefiend's and Khaz'goroth's. My T21 only sims 24k higher than my T20, while adding 3 ilvls, but in practice it works out to more DPS since mistakes in the rotation are far less punishing.