If you keep the electric progenitor from the first week, you can make corrosive/blast and save a mod slot, giving you both viral priming and partial armor strip to make the blast deal more damage. This setup is great for turning the [Sporothrix] into an AOE monster. If the enemies are close enough, a single killing shot will trigger the blast explosion, blowing up everyone near by as well.

This works best with external crit chance. [Harrow] and [Citrine] are great for this as they force orange and red crits respectively.

If you don't need armor strip, an alternative would be to drop [Malignant Force] for semi rifle cannonade and put primary crux in the arcane slot. You can also run a heat progenitor to save another slot and add in [Hammer Shot] for extra status chance and crit damage.