I don't know about Pyrocat, but using Ilford Rapid Fixer or Hypam with PMK negatives has no influence on the stain (despite the PF instruction sheet - I guess Michael that you're correct about the unreliability of the PF instructions...). I've use TF-4 with PMK negs as well as Kodak and Ilford rapid fixers and saw no difference in stain formation.
That's not to say you shouldn't use TF-5, just that, maybe, the notion that more acidic fixers affect Pyrocat stain is false.
Best,
Doremus
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