With the new nvidia drivers, you can use DLSS override presets to tweak settings. There is no descriptions in the app of what the presets do though, which is stupid. Reddit thread was helpful:
Preset A seems to be what I was using in game before the update. Latest & Preset J dropped my FPS by about 10 in the benchmark test. So the override setting does seem to be working.
Btw Some people are reporting crashes on startup with this game. Been fine for me so far.