I hope that this video will plant the seeds for further brainstorming and research on how Righteous Fire can be incorporated into Cold DoT. Although the solution presented in the video appears to work, I think that the playstyle is too wonky and definitely not hardcore viable.

Before (49m DoT, 58k EHP): https://pobb.in/dRVv19dorWl5

After (79m DoT, 65k EHP): https://pobb.in/BumDiKzzGl75

About DoT DPS cap: I am aware of the 35.8m DoT DPS cap. The 79m DoT DPS is based on the Pinnacle Configuration in POB. Monster damage reduction can easily exceed that of Pinnacle bosses under Delirium effect.

I'm happy to answer any Cold DoT questions based off any guide. It will be highly beneficial if you provide a link to that guide so that I have an idea of what you are working towards.