"I find this part of the R&D link interesting. I have heard before that the same thing happens with visual memory, that even the best of artists cannot "hold" a color in their memory and match it back up over time. I don't actually have a test reference for that, I've just heard it."

I don't know. If you're ever in Amsterdam, take a trip to the Rijksmuseum that holds the Rembrandt portraits. You can view some of them from as little as a couple of feet away. That guy had color memory, spatial memory, as well. The painting of the Burghers (?) is painted from the viewpoint of being almost under the table and the light is something else.

As to the Daytons: The regular poly caps work good for me.