all of the China mounts I've seen use ball bearings on both of the axes.
while my AP600 and my old Vixen GP both used plane bearings, which don't have balls or rollers. I guess a less charitable word for these would be "bushings" or "sleeve bearings."
i suspect these sleeve-type bearings aren't too amenable to thicker lubricants, hence my lack of success with superlube.
A very tight fit on metal bushings like those could be more problematic with a thicker grease.