I've noticed "GstRender.FieldOfViewScaleHip" seems to have replaced "GstRender.FieldOfViewScaleADS" despite the former only changes the weapon view model, however either something is fucked up with this setting or it actually changes how ADS interacts with FOV, because I've noticed it feels "stiff" when ADS'ing with it set to 0 but it feels normal when set to 1, but not in a way that it changes your sensitivity.
I could be going mentally insane but its not far fetched considering Dice probably forgot to mention they replaced FOV scaling ADS with FOV scaling hip considering the former no longer works.