Ah I might have had two builds up and looked at the wrong one, sorry.
I'm using Hasten, Combat Jumping, Boxing/Tough/Weave. Rather than Soul Mastery, I did end up taking Stealth/Infiltration/Grant Invisibility for an extra 3% Def from Stealth and 3x LotG mules. My build is attached (I don't have all those purple IOs yet - something to work towards).
Once I get my incarnates, I figure I can move the slots from Inexhaustible and Stamina somewhere else. Hopefully, the End problems and general squishiness will also start to go away 😄
Tanker (Bio Armor - Battle Axe).mbd