Car spoiler/wing with Chaos Vehicle aerofoils

Hi, I am trying to add aerofoils to a Chaos Vehicle car in order to create somewhat realistic and comfortable handling. i have added aerofoils for front and rear wings, but there are some major issues with the setup. These include:

  • porpoising (although this could probably be solved with some parameter tweaks)
  • flying at high speeds (>500 kmh) upon collision with terrain
  • random crashes that i could not trace to any specific change
    I could not find any comprehensive resource for Chaos aerofoils. I have come across an old forum thread, but it does not provide much detail on the mechanics, just quickly shows a basic setup.
    Does anyone know where I can find this info, or explain in enough detail how to solve those issues? Thanks in advance.