Same here - erratic VR behaviour - sometimes hitting smooth FPS and then becoming a Powerpoint Presentation. I noticed that the memory usage gets extremely high (I have 32GB and it loads up to 16GB on a very simple training mission I created in Syria - 7 ground units and my Apache). When I take my Oculus 2 off memory drops to 6-9 GB. And then jumps up when I put it back on again. Switching TADS on in pilot seat just kills FPS and becomes unflyable.
Lowering Texture to Medium has helped a lot - smoother flight and most importantly consistent FPS!
