[![my result][1]][1]
1)The hairs can do hair self collisions only in the same hair particle system! In your example you have two hair systems
2)Internal friction has to be set to 0.2 - 0.8 range.
- density target slider controls collision margin smaller values equal smaller collision distance. Be careful ! values set too low will cause hair explosions.
4)Strength value (ALWAYS) has to be set to ((1)) unless you want interesting hair strands.
- Voxel grid cell size optimal value 0.040
blendfile
