PoE Necromancer, Minion builds

Hello, i've been thinking about build based on Caustic Cloud spread by dying zombies but I'm not experienced with summoner builds. Its base damage is really huge so it's really easy to achieve huge dps, it lasts 4 sec btw Most of my problems are mechanics. My current plan is to detonate zombies with Coruscating Elixir(Umbilicus Immortalis to apply flasks, Maligaro Lens for 1.2k life heal per zombie) or eventually summoning over max(yes it works) but I don't think it's enough. Zombies are meant to die so they are rather low defence, I can't get any special spectres because Flask would kill