In a standard R2000 you would run K7, so shades 1-7 and Gloss optimiser in the eighth channel. This required swapping the shade 1 for matte and gloss whenever you switched papers - effectively just like the MK/PK swap in many Epson printers. My solution to this was to use Warm Neutral shade 1, as it performed well on matte as well as gloss, i.e. a universal shade 1. This came to an end earlier this year, when WN1 was reformulated and no longer worked as well on matte. Recently it has been reformulated again, and it is claimed that it does now work well on matte, although I've seen no proof.
If you wanted to run separate shades 1 for matte and gloss without having to do the MK/PK swap, the solution is to run what is known as Piezogaphy 2. This has shades 1-6 in the usual slots, the gloss shade 1 in the Yellow slot in place of shade 7, and GO. So in effect it is just K6 with both shades 1 installed simultaneously. The bad news is that it isn't officially supported on the R2000. The good news is that it works anyway, if you edit and reorder the P2 .quad files. For more discussion of this see: http://www.inkjetmall.com/tech/showthread.php?1983-P2-and-the-R1900-R2000&p=8804&viewfull=1
So .... in your case you can run K6 for matte papers since you have six working channels. To be able to do so you'd need to edit the P2 quad files so that it's using the correct channels for the correct shades. You can use the spreadsheet posted in that IJM thread to do this, although you'd need to edit it for your particular case, so that cyan and red are mapped to yellow and GO.
I don't see how you can print Piezography gloss. You need seven working channels - for shades 1-6 plus GO. I don't recommend printing on gloss without GO.