Ok, after tinkering with the options for the past 1.5 hours, this is what I've settled on. Not as extensive testing as I would have liked due to having to restart the game every time I want to run the benchmark tool.
Specs: Core i7-9700K, GTX 1070, 16 GB RAM, NVMe SSD
Settings: Maxed preset, Vulkan, 1440p
Average FPS: 31
I've decided to just put it on the max preset because the difference between that and the default medium preset is only about 12 fps with this resolution and graphics card. I just can't seem to hit a consistent 60 fps, so I might as well target 30 fps. I'm happy to say that 30 fps is pretty achievable even at the highest preset settings.
Now, small caveat: this is just with the benchmarking tool. I'm about to jump into the actual story mode now!