Well it's important to note that even though the Lights, GI, and Materials are set to 64 Samples (8 Subdivs) each - V-Ray internally divides this value by the AA Max Samples value of your scene. So instead of the 64 Samples for the light and material each as you might expect, this gets divided by the AA Max of 64 Samples (8 Subdivs), which results in only 1 Secondary Sample being taken for the Lights, GI, and Materials each. (64 Secondary Samples / 64 Primary Samples = 1 Secondary Sample).