Hi,
Your Ragnaros HM strategy is based on all warlocks beeing demonology and indeed armory shows your reforging is optimized for demonology.
Do you do all Firelands as Demonology?
If not do you begin with affliction and affliction-optimized reforging then have a pause before Ragnaros during which you can go and reforge for demonology? How often can you and do you reforge during a raid?