Hey so a couple things,
-socket courtesan mannan's rune of cruelty for Darkness enthroned belt
-use fireflower amulet
-make your way up to take chakra of thought + socket 15% mana before life if you have surival issues (this solved my survival issue when I was using Morior before.
-ditch herald of blood for mana remenants (works great with Mana before life setup), then get palm of the dreamer. HoB is pretty much useless since shattering spite explosions, spearfield + palm of the dreamer is more than enough to AoE.
-take all the DPS flask tree nodes
-Trinity and/or elemental conflux
-you don't need that much AoE nodes, take magnitude ailments nodes at the bottom instead. look up other setups on poe ninja and see
-Good damage lvl 20 Shattering spite Atzuri's contempt
-personally i use rigwalds + rapid attacks 3 on spearfield of bleed3, spearfield on bosses is mainly to apply spite stacks so you want as fast possible, and for mapping the lower damage + palm is still enough for mapping.
Bossing with BM Atzuri's contempt is very easy imo, Shattering spite 2 times, run around, dodge things and wait for bleed. You shouldn't be dying from random things since you don't have to focus on dps too hard when they bleed.