Landscape spline collisions throwing vehicle around

So I am using landscape splines for the roads on my game. I made my own car physics with line traces, so technically the car is not touching the spline at all time, but when it does (for example when the suspension is heavily compressed), the landscape spline collisions are throwing the car around, even at low speeds. That does not occur when the car collides with Landscape terrain, and static meshes neither. I really need this problem solved as it is game breaking right now. I tried to set the collision type to complex on the road mesh, it made the road ray casting more accurate but it stills is very buggy.