The paper I've been using is just white cardstock from Wal-Mart, think the brand is Georgia Pacific. Hadn't thought about that. The paper's fairly smooth, it works pretty well for DTP technique. I'll try it with some of my SU paper when I get home, though, and see if that makes a difference.
As for the brayer, I'm not sure if it's soft rubber or not.
This is my brayer. I'm thinking about getting another one, I believe that Michael's sells the same one that SU sells, and I know they have options for acrylic, hard rubber, soft rubber and foam.
Should I be using regular cardstock, or glossy cardstock? Or is it just different effects on different kinds of paper?