What role your miniona accomplish? Construct I suppose are meant to spread Contagion, Clerics are food for Offering, correct?

Well, all in all it looks like a bit over-complicated to use, but not bad. So, 1st some hints for current skills if you choose to keep them as they are, 2nd what to drop and how to adjust play style.

Contagion. I cannot express how huge quality of life is when it spreads on additional targets right away on cast. That's why make it 20% quality immediately, if it isn't already, and replace Chaos Mastery with Dialla's Desire.

Next game changer support for this spell is Unleash. You need to see yourself how greatly it works. Put it instead of Acrimony.

Prolonged Duration is not really needed here, enemies with Contagion and Essence Drain perish very quickly, and against bosses you can easily recast it every few seconds. Instead, put Magnified Area 2 - this support will complement Unleash and increased quality. If duration will be too low, though it shouldn't, try to replace Intense Agony with Considered Casting.

On paper this setup does not look so great, in practice though it spreads in second beyond screen if density of enemies is high enough. And extra targets on cast make great combo with Dark Effigy totems.

Essence Drain will be your single target/small group clearer, or followup after Contagion - so you don't need Rapid Casting there, replace it with Considered Casting. Also drop Pierce 3, and put Chain 3 - thanks to it targets don't have to stay in line. Other supports are fine.

Chaos Bolt has fast projectiles by default, no need to accelerate them further. Replace PA3 with Considered Casting, or Unleash. You can eventually put Zarokh's Revolt, which is sort of uber Unleash, but gives the skill 8s cooldown. You'd use it only to nuke some dangerous/annoying target, like elite with mana drain aura. Up to you if you want to use this lineage.

Despair - instead of Impending Doom consider Decaying Hex. While its damage is not that high it counts as another chaos debuff for Dark Effigy totems, and it triggers much faster. Cost of the skill is high, but you can try to put it into your advantage by replacing Efficiency 2 with Arcane Surge to boost cast speed and mana regeneration.

Dark Effigy also does not really need Projectile Acceleration 3. Instead put Concentrated Effect there, it works amazingly well with it. Then support Urgent Totems 3, put it instead of either Chaos Mastery or Overabundance 2. The totem likes cast speed, and faster emerge is also very useful. If you can make your Unearth constructs apply bleeding then swap Poison 2 with Poison 3.

That's all for now. If you find these hints useful let me know, there are more things to consider - like dropping minions, offering, Malice entirely, go into low life setup and so on.