Good god, that is awesome. I have wanted a WoW build that works properly for ages.
With your set up and Cubing Goldwrap to free up the chest slot for Cindercoat. To adapt this for Mid tier GR farming. Could you not put the Firebird's chest on and use Orb of infinite depth to scale your damage and damage reduction? Then that frees up your cube armour slot to put on the 50% dmg reduction when over 90% resource chest.
Just a thought. It wouldn't be efficient at pushing the cusp, but farming 10 to 15 GR levels below your max is probably possible?
Yes exactly, glad you thought about it that way.
Thought about it myself already and have that setup, just have not tried it. If you get better rolls and more dmg you can even consider wearing Halo of Arlyse & SoJ or CoE and use Ice Armor. You will drop some dmg from obvious sources but stay alive better.
It all depends what level you can speedfarm. I mostly use my keys to farm higher GR's than I think this build would be able to speedfarm easily, so I think it will shine the best on Tx