I also feel like it's gotten a bit worse.

With avoiding every in-world combat (so no fates, no other quests) I managed to play the Story fairly audio-issue free by only using the Trust system and avoiding playing with other players as much as possible.
Over the weeks it went from 100% audio-crackling down to maybe a 40%. I even managed to do a dungeon or two with friends with minimal issues during intense fights

Now I've entered the same dungeon and it immediately starts with distorting the sound and I could only minimize the issue by looking down and away from the fight (not gonna have to explain why that isn't a "fix").
I muted the game for half of the dungeon since it wouldn't get better even out of combat. Unmuted it halfway through and only had the issues within high-action combat.

And since SE mentioned it, yes I have my Hz already on the lowest possible setting since it was one of the things the community found early on that helped me reduce the amount from 100% to 40% of the time (besides other things that helped, like putting listening position to 100, I am still in awe as to why that helps reduce it).

So waiting 2 weeks for nothing, maybe even making it worse, is quite the feat.