Thank you for the tips. It is just so frustrating, when you tweak everything until you are happy with performance. Then they bring an update that makes everything worse. Even very expensive hardware does not change that.
So what OpenXR render scale are you using? I set mine to fixed 130% to get a not so blurry picture. With FSR quality FPS are at 35 -38. That is ok, but worse than TAA and it brings some artifacts.
The 7900XTX should perform much better. In 2D it is a beast. AMD should really fix that VR performance.
In the end I rolled back to 23.3.1. At least I get about 35 - 38 FPS with OXR 100, render scale 100 and most settings at high. The sharper image is important for me in the airliners.