Sorry Al, missed this. Like you I found the red tips are subject to flaking if stressed, sometimes only gentle prodding will do it.
I tried some tests with the blue "spudgers" and while the flaking wasn't as bad as the red Bergeons, there was still some residue. I noticed that the flaking was coming from the surface layer and figured it may be a combination of surface finishing from injection moulding and "sprue" effect. I sharpened one with a razor as you would a pegwood stick, this exposed "virgin" plastic and doesn't seem to have the same problem.
It's still a PITA having to sharpen them though, so I may commit them to phone use and track down some acrylic versions.