Ok... so the prints look great through the water developer - but fade directly on fixing.
My suspicion is that the thiosulfate fixer is bleaching (when done as in the Bostick & Sullivan directions). At about 1 minute it maxes out in density and begins to lighten. So the question is - what's the minimum fixing time for this process that won't lead to self-destruction later?
Or is something else going on here? 50g of hypo seems like a lot for 1L of water.