PoE Added Fire Damage, Bow builds

Hello guys! I 've played a Barrage build in a CoC setup with Poet's Pen and Flame Wall before and liked it and I thought I could maybe try something similar, with the difference that Barrage will be my main damaging skill. Made a pob that looks quite promising, Sirus dps is 1.7 million with Enemy Low-Life ticked and by the looks of it, its defenses seem ok, though I could use a second opinion regarding this matter. The build has about 7500 EHP, but no other defenses other than block, Rumi's and Endurance Charge generation which is questionable. I'm using Rote Reinforcement for Endurance Charg

Leveling (Not tested) -Create a witch and level it to for grab flamewall and arcane surge -With Chieftain us Fireball + Arcane Surge to level 4 -Use Holy Flame totem + added fire damge + Combustion and fireball with arcane surge - At level 12 grab searing bond + combustion with HFT - Craft a fire damage wand with an alteration + ruby ring and magic wand or scepter as soon as possible. -Be on the look out for high physical dps bows. -Switch to Artillery ballista after library 2 reds 1 green or 2 greens 1 red Artillery ballista + Elemental damage with Attacks + Added Fire Damage or Vici