Copy-paste from my YT comment:
I have this now added to the engine.ini located at C:\Users\your-PC\AppData\Local\AC2\Saved\Config\WindowsNoEditor
I haven't tried to optimize those values yet but it already significantly reduces the blur from TAA I still use on the high setting (and 130 resolution scale). It reintroduces a bit of aliasing/shimmering compared to TAA high without those commands, but the blur reduction is worth the compromise in my opinion.
Complete list of UE4 commands here: https://digilander.libero.it/ZioYuri78/
Then filter on "renderer" commands at the top menu.
If anyone is used to those commands from other UE4 games and know which ones are the most useful in VR please share