3.9 Voltaxic Rift + Lightning arrow stacks? Shocks and my failed build (kind of) - Path of Exile

Character Level 90 Assassin Bandit: Alira
Pools 5,829 Life 394 Energy Shield 975 Mana
Defences 2,711 Evasion
Resistances 75% Fire 75% Cold 75% Lightning 24% Chaos
Weapon 1 Voltaxic Rift Spine Bow
Weapon 2 Onslaught Spear Spike-Point Arrow Quiver
Helmet Bramble Star Vaal Mask
Body Armour Inpulsa's Broken Heart Sadist Garb
Gloves Oblivion Fist Sharkskin Gloves
Boots Rage Dash Crusader Boots
Amulet Cataclysm Heart Amber Amulet
Ring 1 Horror Twirl Unset Ring
Ring 2 Sol Hold Sapphire Ring
Belt Honour Lash Heavy Belt
Flask 1 Chemist's Divine Life Flask of Staunching
Flask 2 Experimenter's Diamond Flask of Warding
Flask 3 Perpetual Quartz Flask of Heat
Flask 4 Atziri's Promise Amethyst Flask
Flask 5 Surgeon's Quicksilver Flask of Adrenaline
Crimson Jewel
Grim Prism Searching Eye Jewel
Morbid Barb Searching Eye Jewel
Body Armour Scourge Arrow 18/20 Inspiration 18 Added Lightning Damage 19 Infused Channelling 19 Elemental Damage with Attacks 19 Slower Projectiles 20
Gloves Wither 18 Spell Totem 18/20 Multiple Totems 17
Boots Despair 20 Cast when Damage Taken 1 Curse On Hit 18 Wave of Conviction 2
Helmet Precision 14 Enlighten 2/20 Herald of Thunder 20/20 Wrath 20
Ring 1 Greater Multiple Projectiles 19/20
Weapon 1 Withering Step 18 Lightning Arrow 18
Weapon 1 Blink Arrow 18 Faster Attacks 20