I have been making tweaks to the crash values along with spins and lockups. The problem is I am just one person and need some more data to know if it works.
You will need to download the True Endurance mod (don't worry I have GT and single seater .xml files in there too because I want data from all 3 race types)

Once you download the mod you will need the resources.assets file from my discord server as well as an assembly-csharp.dll from the dll test channel of which I have 3 choices. A 'do it all' which is basically the original way to play, a 'no micromanagement' and a 'macromanagement' version.
https://discord.gg/UqJ95x

You will need to start a new career and I ask you post screenshots of the race results.