For anyone wondering:
Try out lumen reflections with these commands, should make them more stable without TAA and give more performance.
r.Lumen.Reflections.DownsampleFactor=4
r.Lumen.Reflections.MaxRoughnessToTrace=0.31
r.Lumen.Reflections.RoughnessFadeLength=0.019
r.Lumen.Reflections.SmoothBias=1.0
r.Lumen.Reflections.ScreenSpaceReconstruction.KernelRadius=0.14
r.Lumen.Reflections.BilateralFilter=0
What this does is centralize reflections where they are needed, lower the reflection resolution, and then reconstruct a shinier/more clear output.
You might need to rid TAA and jittering upscalers like DLSS or these reflections will wobble.
Was helping a friend get better/less noisy reflections in a game.
Hopefully I can do a piece on that games performance here soon.
Update: This caused artifacting for some people, so of course use common sense and see if it works for your specific project/scene.