I've noticed that with certain glossy papers, namely HP Advanced Glossy, and especially HP Premium Plus glossy, I'm seeing pizza wheel marks on prints from my R2000 (I also got them on my R1800 with these papers).  Most of the time they're not very noticable, but often they are quite visible in dark areas of a print.  I usually don't get them when using Epson Premium Glossy, but even on this paper I see the marks on occasion, again only noticable in very dark areas on the print.  I have experimented with holding a hair blow-dryer directed into the paper exit path, or into the area between where ink gets laid down and the exit rollers, and it seems to help quite a bit in eliminating the marks, leading me to suspect that the problem arises from insufficient drying time between when ink is laid down and when the print traverses the exit roller with pizza wheels.  I read somewhere that the surface of some glossy papers, HP in particular, "swell" a bit, mostly with pigmented inks, and take longer to dry than papers designed specifically for pigmented inks, like Epson glossy paper.

I was wondering whether there was some way to slow down the printing process to give more time between the application of ink and the movement of the paper.  I typically print glossy prints with the highest quality and bi-directional unchecked, but this still doesn't afford enough time for the ink to dry on the HP papers.  I know Fred said earlier that he doesn't see them, but it does seem to be a problem with a number of Epson printers.  As I said, it's hard to see them in lighter areas, but in dark areas, if you tilt the paper just right and reflect light off the surface, they are there.

Any advice?

I looked up HP Premium Plus Glossy Photo Paper and the HP site says:
"Pick up your photos straight from the printer. These durable photos resist water and humidity* – and instant drying means you can handle them immediately without risk of smudging."
Are you using genuine Epson ink?
Terry

Yes.

I didn't mention earlier that I too have R2000 and have used Ilford Smooth papers, gloss and pearl, for some time and never had any problems with marking on the prints. In fact I have just checked a number of prints to confirm there are no "pizza wheel" marks.
It seems there are quick drying  and not so quick drying papers 
Terry