I have found that Pyrocat gives a little more film speed than ABC. I shot 2 sheets of BPF 200 @80, did one in ABC and one in Pyrocat. The shadows in the Pyrocat negative were denser. I don't think it was a whole step though, more like a third. I'm curious about your problems with ABC. The reason I was trying Pyrocat was a problem I was having with uneven development with ABC. I was getting a mottling in even toned areas, skies, water, etc. What problems were you having? Did any of your remedies work?