Very good job mate, many thanks. I have less stutter and/or less harsh, above all I get rid of that ridiculous overexposed bloom and now I can see snow tracks.
But generally speaking, seems to me that the game is still an early access, hope that an official patch will be released soon: ok, my pc is quite old nowadays, but meets anyway recommended specs except for a bit outdated CPU (I have good fps in general though), but stuttering and other issues are reported on actual high-end PCs too, no matter about your resolution and graphics downsizing. Moreover, seems very unoptimized and not using all the actual available hardware (don't even a cooling fan works, differently i.e. from Dirt 2.0 or Snowrunner, my pc seems at idle all the time). Finally, using for a racing title a gfx engine well known for being high demanding vs poor performances and doesn't look very well too seems a technical suicide for me.