TLDR: When farming just Voll, maybe make him just find Voll and ignore other mobs, or have it focus Voll when character does find him; not his minions.
Selecting Act 4 and running Voll basically just runs like Dried Lake, but looks for Voll and kills him.
An option to just find Voll?
Or can be as it currently is, but when it finds Voll it will focus him and not his surrounding summonings.
Some of my builds can easily facetank Voll, but in instances that it decides to waver away from focusing Voll and attacks his minions instead, the character often dies because it does not have a stable target to life/ mana leech from.