Above quote is right on and may well offer some insight to why many are seeing a need to bump contrast filtration with Pyro negs.
My experience tells me that Pyro developed negs do not like heavy exposure, this tends to move much of what we saw as dark tones in the original scene to move up onto the straight line and be impacted by development and in the case of pyro, increased stain. This is also the exact reason I do not redevelop pyro negs in used developer, the stain compromises mid tone / edge contrast and that is the single most difficult component of printing to get correct.
For me personally, my pre pyro negs were heavy and required a lot of manipulation in the darkroom with graded paper to get the effect I was looking for.
I find quite the opposite with Pyro negs and Multi Contrast paper, a well exposed, almost @ manufacturer's box speed and developed to a lower contrast index to yield some of the finest prints I have seen.
I use exclusively Pyrocat HD, the first stuff Sandy formulated and find it works well with continuous agitation or with reduced agitation regimes. I mix it from powder (the most toxic as dust can cause respiratory problems), once in liquid form it is quite safe and extremely inexpensive.
Sandy King has spend untold hours and research on formulating Pyrocat, I cannot understand the debate about developers!
Go make some photographs!
Thanks for the insight on this Steve. I may well try Pyrocat one day when I'm back to sheet film!