Need feedback on skilltree/build for hardcore Arc-Scion life/acro/block

Seems to me that most of "can you take a look at my skill tree" threads are ignored, but heres to hoping someone can take a look and see if my skilltree is optimized for the purpose of:

1) Hardcore league (survival)
2) Node choice (for arc)



Note that this skilltree has skills all the way up to lvl93, but it will be done by lvl80. The ones I filled in are in the witch area into her inner starting zone (10 skills all DPS at that point).

The idea is to create a life/block/spellblock/dodge/spelldodge/evasion arc caster.

Arc <--- main damage
+Lightning penetration
+Added lightning damage
+Spell echo
+Faster casting

Cast on damage taken <--- Obvious physical defense choice
+Increased duration
+Enduring cry
+Immortal call

Tempest shield <--- Max block + Max spellblock should curse all enemies on block
+Curse on hit
+Enfeeble
+Temporal chains

Cast when stunned <--- Another line of defense
+Ice nova
+knockback
+Blind

Lightning Warp <--- Mobility/Teleport
+Faster casting
+reduced duration

Utility
Clarity
+?
+?