Which season? What assists, setup (steering lock especially)
If you wanted to drive without any helps using even slowest 99cars, then yea its slippery, only method that worked for me was neutral/slightly understeering setup with low sttering lock like 8-10deg (12deg being normal when using TC) . Another thing is that many default F1C tracks had huge bumps leading to easy spins. Smoother rF converted tracks come to help (best example Malaysia).
Default FFB is bad, but theres Julien Regnard guide, or try mine set based on this guide
Our discord F1C group has over 300 users now,
https://discord.gg/awnA9rt
You can find there setups, tutorials, detailed modding help from EvilClip - multiplayer exe fix creator etc.
We even run leagues lol, next one using V8 Supercars mod
Cheers