PoE2 Infernalist Bug [Insta-Suicide on Bosses]

I am running into a bug with my infernalist. It appears I am taking damage based on the damage I deal with infernal flame?

Essentially, my character has 113% recoup, and I am unable to kill myself with infernal flame even if I try. Yet, when I hit a boss with my cold snap (big damage skill) I instantly die, every time from killing myself. This even occurred with an under leveled (77 in a 65) sekhemas boss. Unless I am missing something, the infernalist damage shouldn't scale based on your hit damage.

I've recorded a video troubleshooting with some items on my class.
https://www.youtube.com/watch?v=20rQ0N58zGY&feature=youtu.be

At first I thought I was getting hit with thorns or something, but that doesn't scale based on the damage taken from hit, at least for players. According to PoB I should be able to take 4.2k phys hit without dying, 4.1k chaos and 14.7k ele.

As it is now, I am unable to do any bossing with this build which is unfortunate as it kinda melts.

Actually after thinking about this, my Cast on Crit might just be casting cold snap continuously, re-critting each cast because of massive energy gain versus bosses. I could quit literally be Critarded.