Nothing is free. All that upscaling and downscaling costs.
My settings for my G2 are working pretty good.
OpenXR: 75% custom resolution.
WMR: Best Quality Highest Resolution, 90hz.
OpenXR Toolkit: 100% CAS, Set World Scale to match your Inter Pupil Distance. Reduce Field of view to 90 degrees. Shaking reduction is good too as well as Foveated Rendering and Eye tracking, if your headset supports it.
Game settings, TAA 100% (CAS is designed to work with TAA), DX11 (DX12 is still beta).