Mark, I'm glad that you made the paper(s) work. Have you used citric acid?
P.S. IME, exposing Vandyke when it's relatively "damp" (a la Ziatype. IMPORTANT: I put 2mils polyester between the negative and paper in order to protect the negative. It also helps in masking the inherent grain you may get with the non-mentionable workflow...), you get a much colder untoned image, and slightly greater dmax. (The latter for both the plain and toned image.)