Leonard75 that's weird. When i try some 8k it doesn't seem i need to change vertical offset (i am on quest 3).
It is not weird because vertical offset on those videos is ok or perfect (if links dont work use the 5 last digits to search). I am talking about horizontal offset π That is slightly different from your topic title but I count it same. Both affect to picture quality and are handled with good post-production.
Horizontal offset is way more common and harder to spot than bad vertical offset because how our eyes and brain works. I dont have statistics but maybe 20X common as bad vertical offset.
Your example from Fantastica studio is little bit irrelevant. I tell you why? Because I would rank it as C = bad quality studio. Picture is awful. If there is bad vertical offset, I would rank studio quality bad and all of Fantasticas videos suffer from this. It is bad quality studio. If you like JAV porn, KMPVR is number 1 by far margin. They also have some bad videos but also those rare gems no other studio can produce.