With a fresh build of Windows 10 21H1, the latest Reverb G2 firmware and both 457.30 and 462.91 drivers, I can confirm that in my case - it was a waste of time. Tested with HAGS enabled and disabled, no difference.
Head movement remains extremely juddery in the A320. Has to be game/optimisation specific
Edit: For some reason it’s actually worse, it’s picking up on every tiny head movement/shake.