Why not just tone in a polysulfide toner, like Viradon, or Kodak brown toner? Beautiful chocolate brown tones..
I could. A: I don't have any in stock right now, B: I was trying to use what's on hand, C: I wanted to see what could be done with the papers/developers at hand. I just did some prints this morning with the Bergger COT320 and the Ilford Warmtone developer, and they really aren't much different, except that the Bergger emulsion is a LOT slower than the Ilford (a good 2 stops slower). When the prints are dry, I'll scan in one to post.