APX 100 in PMK is beautiful. Gorgeous. I can't speak about Pyrocat-HD and this film.

APX 25 doesn't stain much in PMK. I only tried it once.

Pan-F Plus supposedly doesn't stain much in PMK either, and it does have less stain than other films, but I sure like how the negatives print. I have adopted PMK as my standard developer for this film. (I seem to have acquired 200' of the recently-expired stuff from Freestyle... oops. )