Displacement baking issue

So I have this high poly model that I need to use in low poly with subsurf + displacement modifiers to have a lighter file in the end, but I can’t bake the displacement properly.

I tweaked the “distance” and “bias” values for a good hour (and the “normalize” checkbox) but I can’t reveal those black areas :

Do you have any idea ?

The model is a bit complex (the insides are also modeled, as you can see in the eye) but it’s still very clean.

Whaaaat ?
I did the exact same operation and now it works.
Maybe it’s because I Loaded the factory settings but I’m really not sure.
Anyway, it works now. YAY !
But if you’re having a similar issue, post about it here, I’ll help you figure it out.