Don't Epson have a "Plantine" surface paper equivalent? This statement by the Epson representative sounds pretty dubious to me.
Of course, they do. I don't know if those settings apply only when using Printer Manages Color, or as individual icc profiles. But because I'm printing either through ImagePrint using their profile, or my own custom profile for the Canson paper and my P800, and the fact that I coulda/shoulda mentioned that during the call, I guess he felt that wasn't relevant.
The IP profile uses Velvet Fine Art for the media setting and my profile (which I use printing through Lightroom), uses Epson Premium Luster. I have tried different platen gap settings with Lightroom, and IP doesn't have that option for paper thickness. There is a Media Feed setting but I was told by IP support it is for banding issues. I did try changing it anyway, to no avail.