Undying aspect, “when you cast a skill, you heal for 2.0% Life”, whilst having temerity on and having 37403 HP, provides 254 barrier. Removing other armour pieces so my HP goes down to around 24k, it still provides 254 barrier.
254 being 2%, 254x50 = 12700, looks like this aspect still works on base life instead of max life. Or I am just missing something, someone smarter could look into this.