You want to reduce the ‘Max tiles out per frame’ in the feedback buffer settings from my testing.
This applies to my AMD GPU and AMD CPU, but I would assume that it translates the same.
If the 'max tiles out per frame is at 64 at 60fps and you set it to 32 or 16, it will result in the same tiles out over time at 120fps, but with less aggressive spikes when loading assets, hence reducing the ‘Dips’.
From my post here, try and change just the max_tiles_out_per_frame and max_streaming_tiles_per_frame values form 64 to 16 and let me know how it goes.
You could also try and mess with buffer sizes under the feedback streamer, though I can’t confirm if this works on NVIDIA like it does on AMD (completely fixed my performance).
You can also try my texture streaming config fixes here which I know has helped NVIDIA users with 12gb of VRAM or more.
Hope this helps.