Every E attack Combo End u Force a Knockdown triggering Afflictions.

Has to be played with an Attack speed buff for optimal performance & Afflictions Procs. (We simply cannot fit it in without losing the build& the physical dmg)
U can technically play Berserker Fury in instead of Condition Overload (it seems fine) but u will lose a good chunk of scaling.
Gauss,Volt,Wisp & Nourish / Panzer Kitty, Secondary Viral priming for lvl cap type enemies.

Best Progen Element would be ur Dot of choice to further Scale with Elementalist & Afflictions.