it looks to me the fotospeed lith paper. about the delutions... lith is not a consistent thing as the regular silver print developer - so u have to experiment. those pics that u talk about seems to me towards very deluted lith, it also doesnt show too much blacks dots (that personally i love very much), so the fog resistant probably added in significant quantities.
as a starting point i would say to delute 20ml +20ml on each litre (if u use fotospeed developer)
and add as a starting point 20ml of each fog resistant.