Hi Rick.Ear4audio,
i have to ask; what are you using to take the stylus tip close up images you've posted here? Fantastic stylus close ups!
I'm using a standard biology microscope that's meant to view specimens on a slide. I found I can go as high as 250x and still stay in focus. Anything greater will cause damage because the lens has to actually touch the stylus to be in focus. I found a usb camera that replaces the eyepiece on Amazon. Once I get the stylus in focus, I swap out the eyepiece with the usb camera and I take a picture. It takes a while to get the angle and lighting just right so you can see the edges and facets of the stylus but I'm amazed at the different ways the manufacturers used to shape the tip.