Part 14 Graphical Issues-Makes ending unplayable

Playing on Windows 11 Steam, starting in Part 14:

I have been getting graphical issues where they spasm/flicker with different parts disappearing and reappearing rapidly. I've updated all my drivers/windows/and uninstalled and reinstalled the game. I've dropped all my graphics settings to the lowest possible and in doing this I've found I can set my watch by when these glitches happen and what they do. Because of that I was able to record exactly when they happen.

Final boss is the worst where he's constantly flickering in and out and was just floating hair for a good chunk of time. Parts of the background would vanish then parts of the model would go in and out and it happens rapidly then just sit on floating hair. These issues happen constantly and during the actual fight as well as the cut scenes. 

I haven't had any issues with this anywhere else in the game. Please advise or please fix this issue. I'd love to play again and recommend it to other people who are dragon age fans but are holding back for one reason or another, but this makes it hard.

I have attached some instances in video on this happening.

(Anyone reading who hasn't beaten it yet, beware of spoilers)