He Kilikiki! Thanks for you feedback and taking the time to write up your thoughts. I'm happy to hear you've been having enough fun to play for 50h or so, and sad to hear that you're being so frustrated by the boss. Let's see if we can fix this.
Do you have a recording of the fight or can you describe in more detail what makes it so tough for? Is it the bosses ability that escalates? Or is it just the fact that the boss can proc it himself? If so, how specifically did they proc it? I'm trying to get a better feel for the issue before I make any changes. Also, if you're in the Discord, do come by and we can chat about this, maybe see if I can get a better handle on the issue. Overbalancing and nerfing the boss isn't something I want to do either, so the more info you have, the better!