UE 5.5 Images are blurry compared to UE5.4

I am developing a VR game and after switching to UE 5.5 the image got blurry. I already realized that vrPixelDensity is gone and used xr.SecondaryScreenPercentage.HMDRenderTarget. With exactly the same settings the image does not look that crisp and even looses 10fps. I am using deferred shading with TSR anti aliasing. You can even see it in the viewport so its not only a VR issue its only in VR much more obvious. I hope someone can help me UE55 fixed a couple of VR issues I do not want to miss.