It is said a few drops of photo-flo helps solution A "drain" of the surface of the film more evenly, which might help promote uniformity when the film is put into a highly alkaline bath B in which development is extremely rapid.
I use and like Pyrocat HD in both tray and Jobo. I have tried it divided and find it is another in the list of "Silver Bullets."
Divided D-23 and AB-55 are the first two which come to mind. Divided D-76 was looked at in the same way at one time. All have worked, but none have been the "Silver Bullet."
[FONT=Comic Sans MS]Films NOT Dead - Just getting fixed![/FONT]
I'm not sure of the need to use divided Pyrocat in these conditions, I have no problems with negatives processed in Pyrocat HD 1+1+100 in harsher lighting, and never had a problem with Xtol (replenished) or Rodinal either.
There is no "magic bullet" or "holy grail" in photography. One of the things you learn is that there is always a price to pay for any particular advantage in photography.
I will attest to this. 95% of any photographer's success has to do with technique and knowledge of HOW to use our materials, not what materials we use. The only magic is between your ears, and how you use it.
Now, if you're like Bob Carnie and you like solarized negatives, for example, just any developer will not do. I get that. Special purpose stuff.
"Often moments come looking for us". - Robert Frank
"Make good art!" - Neil Gaiman
"...the heart and mind are the true lens of the camera". - Yousuf Karsh