The new log is showing this error now:
12:16:44.252: error: Failed locking bitstream buffer: invalid param (8)
12:16:44.252: [NVENC encoder: 'streaming_h264'] nvenc_encode: Error encoding: Invalid argument
12:16:44.252: Error encoding with encoder 'streaming_h264'
Here is the link for the search results from the forum for that error
obsproject.com
According to both logs, it appears that you do have the latest Nvidia driver installed (461.09). Maybe a clean install is in order. FWIW, I'm using Studio Driver 457.30 without issue.
Some additional troubleshooting suggestions
Make sure you don't have too many encoder sessions active. (3) is the max.
In both of your logs, your main monitor is showing up as:
output 0: pos={0, 0}, size={1750, 1080}, attached=true, refresh=240, name=VG279QM
But it's native resolution is 1920x1080
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Try setting the resolution correctly & @ 120FPS for testing.