You can always go back if you clone or image the Windows 7 system before you go changing things.
The same driver revisions work well in Windows 10, but that complicates your ability to keep using older drivers unless you do some workarounds, plus then you'd probably want drivers optimized for DX12 as well. I will say that any of the pre-Vulkan drivers have pretty good DX11 performance and the last ones 456.71 + 456.98 addressed some major security vulnerabilities, but you did specifically ask for the best fps.
If you installed the latest driver for 64-bit Windows 7 then you already had 466.27. But 391.35 from 5 years ago was the last for 32-bit Windows 7--I am assuming you were not using that one because it still has fine performance only with some rendering artifacts in some more recent games.
And yes, I agree Win 10 on SSD feels much the same as Win 7 on HDD