Hi Jordan.
I re-meshed and used a STL with coarser triangles. With stl_small_angle = 0.1 the particles still behave with irregular high velocities. It seems the happen when the particles move over the internal surface.
Attached the .mfx and output file if that can give any insight, unfortunately I can not share the STL file.
Thanks
settling.zip (13.5 KB)