I think the hairspring looks ok. In the static state the coils appear concentric and I am of the opinion that the rather weighty stud explains it,s apparent lack of flatness.. I am wondering if there isn't a problem with where the hair spring is attached to the stud. if it is not formed correctly there, I think it would move the h/s off center, causing you problem.
Chronometer competition of course, sorry I was writing in haste.
https://www.ikigai-watches.com/interview-with-the-watchmaking-father-of-the-modern-mechanical-grand-seiko-mr-akira-ohira/5472