Updated with new Galvanized mod ([Galvanized Shot] are not properly apply to this weapon, the effect only slightly better than [Hornet Strike], far worse than [Lethal Torrent] in this build. If developer fix it, replace it for [Lethal Torrent])

You can choose to use viral heat or corrosive heat (either 60 or 90s mod work)

You can play around with regulator formular here (credit to Wisdom for making this)

https://www.desmos.com/calculator/vgcrrgsk0a

On steel path or endurance, use corrosive with viral primer and keep [Primed Heated Charge] is better (or have some kind of armor strip). If u dont strip armor, viral heat better against alloy armor while corrosive heat better on ferrite armor. With viral primer, coro + heat do fairly well agaisnt anything
Change the element combo and faction mod according to enemy you are facing.
For kuva lich and some boss or deimos open word: Corrosive + heat
For corpus: pure tox
for general: viral + heat
For index: Rad or tox (rad is better on armor scaling)
For Sentinent (need to have more than 199% str) :https://overframe.gg/build/181383/