Your setting look about what I was running on my older system which had a 3080ti and an i7. Unfortunately the frame rates you are getting are very typical for that area. LA area has always been hard my system even my current 4090 and i9 12900k struggle.
Again it comes back to the sim not being optimized for multi-core use.
There is a very good video on YouTube by 2020 flight simmers. (I think that’s the name) which may help you tweak out a couple more Fps by changing some Nvidia settings and optimizing your data paging and system cache.