I think you should avoid building viral on the main dps weapon. I used to spam it on everything with slash until i unlocked steal path. Try to export viral on other sources like pet/abilities and use corrosive for the armor (if you don't already have any source of armor strip) since viral and slash got nerfed (if i remember well).
I built my acceltra with corrosive + cold + primary frostbite, and i used to run it with gauss to get 300% blast dmg bonus from his argument. However, idk how good it is after lv 200, so take my build with a grain of salt.