"wash only shortly, you live in danger of having dichroit fog on your negatives "
Oh no! What is this - please elaborate.
I have putting my sheets of film into a tray of water (prior to fix) to allow shadow development to continue as I mentioned-works great- this causes some kind of fog?
Do I have an archival issue with these negs?
the only time I experienced that kind of fog was with RC paper - it resulted in a pink stain in the white borders.
What happens is that development continues in the fix, fix and dev work against each other - my best guess is that the desensitizing or sensitizing dyes are responsible for the tone. But I have heard that it happened on film, too, there was a sample posted at photo.net a while ago.
The guy ended up with partially pink casted negatives that might influence the print in the way a staining mask does - imagine a evenly toned texture, partially stained and thus showing differences in the tones on the print.
But you are probably safe - you let the developing agents do their work on the emulsion and "die" before putting the negative in the fix.