UE 4 Character self shadowing not working

Splidsecond

Hey guys, 

I am setting up a character shader in UE 4.11. The probelm is, that the light is "leaking" through the mesh e.g. of the cap onto the face or through the face onto the mouth. 

My material setup is like following: 
Cloth - UE cloth shading model
Face - UE skin shading model 
Mouth + Teeth - UE Default Lit 
Eyes - Eye Shader from the UE Example Map 

The cap and some parts of the cloth are only "planes" so, I had to turn on two-sided. 
Does anyone know how to fix the light leaking/ wrong self-shadowing problem? 

Splidsecond

Our solution for this issue was adjusting the shadow bias in Unreal as mentioned here: https://answers.unrealengine.com/questions/509418/self-shadow-in-realtime.html