Jon was working on a dual quad set that you could mix at will with the qtr sliders. Select one or the other, blend at will, including highlight, mid, and shadow exclusive percentages. This would be ideal for most wanting hue flexibility. I don't think it's official yet, but I might recall they can set you up on it with an inquiry.
Yes, any of these sets on a PK paper, then treated with GO, are much more "colorful" than the same set on matte. Since most sets are warm, even the selenium is reddish, gloss prints are warmer for sure.