Physical status proc has an innate 4x chance compared to elemental damage, so the probability procs are almost 40/40 between viral and slash (10/10 impact/puncture). Viral will increase damage and stack up to 10 times on an enemy with slash proc bypassing armor as well as being increased by viral. It's very common to see hits in tens of thousands even at a low combo counter and the highest I've seen at max combo counter is 150kish through the crits, regularly I saw it go around 60k-100k.
This build can be done with a regular [Fever Strike], sustained DPS will drop like 10k ish but also won't require a 3rd forma and endo cost will lower a lot. A cheaper alternative that still gives a lot of DPS.