alright an update..... (I know many of you were waiting patiently. heh)
I tried another three sheets of 4x5 shot at the same time and the resulting neg were good. in fact, the ones I initially developed actually look alot better than I first thought. the discoloration isnt there any more and the negatives have a really subtle contrast to them with wonderful detail throughout the entire tonal range.
interesting the distinct difference between Pyro and my usual rodinal.