I have a similar setup than you and i get decent performance using Virtual Desktop. I don’t use the link anymore for MSFS, too jerky, stuttery…
Virtual Desktop settings on HIGH, 110mbs stream, SteamVR oculus runtimes, good to go.
And I keep my PC settings the same as VR in game. I even put my PC settings to a similar res than my Quest 2 which is around 4K.
My thinking around this is if the game loads with 1080p settings, is it loading textures and assets for 1080p ? It gives me the feeling that the loading part is loading relevant data for 4K rendering which is my Quest 2’s resolution. But I could be wrong 
hehe
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