Hello Andrea,
Agfa No. 108 might provide sufficient contrast; it’s best to use double the concentration on the first attempt:
http://hem.fyristorg.com/pbackman/recept/demina.htm
Otherwise, you could try Lith developers.
Removing the fog is usually the job of the toners; in this case, you would need to overdevelop and/or perform overexposure beforehand so that the density becomes high enough to match the fog. But first, the issue of increasing the gradation must be resolved.
Regards, Wolfgang
