[PoE 3.15] Having Mana & Damage Issues For Toxic Rain in 3.15?? Here Are Some Suggestions

Character Level 87 Raider Bandit: Kill all
Pools 4,503 Life 209 Energy Shield 777 Mana
Defences 2,335 Evasion
Resistances 63% Fire 75% Cold 59% Lightning 28% Chaos
Weapon 1 Corpse Wind Highborn Bow
Weapon 2 Blood Barb Penetrating Arrow Quiver
Helmet The Gull Raven Mask
Body Armour Blood Salvation Commander's Brigandine
Gloves Soul Palm Trapper Mitts
Boots Onslaught Pace Hydrascale Boots
Amulet Horror Idol Turquoise Amulet
Ring 1 Profane Proxy Unset Ring
Ring 2 Viper Spiral Two-Stone Ring
Belt Agony Buckle Heavy Belt
Flask 1 Saturated Divine Life Flask of Staunching
Flask 2 Seething Divine Life Flask of Heat
Flask 3 Perpetual Quicksilver Flask of Steadiness
Flask 4 Perpetual Quartz Flask of Resistance
Flask 5 Enduring Divine Mana Flask of Acceleration
Behemoth Vessel Viridian Jewel
Honour Wound Cobalt Jewel
Weapon 1 Caustic Arrow 19/10 Mirage Archer 19 Void Manipulation 19 Efficacy 19 Vicious Projectiles 21/23 Swift Affliction 19
Body Armour Toxic Rain 19 Void Manipulation 19 Efficacy 19 Vicious Projectiles 19 Swift Affliction 18 Ballista Totem 19
Ring 1 Despair 21/23
Boots Toxic Rain 19 Toxic Rain 19
Gloves Malevolence 19 Pierce 19 Summon Skitterbots 19 Puncture 19
Weapon 1 Swap Toxic Rain 19 Toxic Rain 19 Toxic Rain 19
Weapon 2 Swap Toxic Rain 19 Toxic Rain 19
Helmet Burning Arrow 19 Despair 19 Second Wind 19/9 Withering Step 21/23
The Gull Second Wind 19/9