Here's a section plane view of the whole body (primary element size = 0.05):


Zoomed in on the sphere of influence (element size = 0.01):


Zoomed in on the contact between bodies (small bodies element size = 0.001):


Mesh skew = 1.

I'm going to try and increase the mesh size in the small bodies.  They're pretty complex, but looking at this contrast, the elements seem excessively small.