If simply changing the Ansio filtering fixed it for you, I don’t believe you had the real issue in the first place. Please have a look at these two clips: Is this what you were experiencing before, and now it’s gone? Or was it something milder? This is the type of shimmer I and most others are talking about, except it looks even worse in VR:
Building shimmer: [BUG LOGGED] Shimmering/AA downgrade since SU5 (in-game, not menus/overlays) - #69 by CptLucky8
Tree shimmer: [BUG LOGGED] Shimmering/AA downgrade since SU5 (in-game, not menus/overlays) - #144 by CptLucky8