My belief is that if there is a loss of film speed with stand development with either FX-2 or Pyrocat-HD the reason is development time was not long enough for the dilution used. In this case it is merely a question of getting the right combination of dilution and time of development. So if you are getting reduced film speed with eithe of these developers I would recommend that you either make the dilution slightly more energetic or increase development times.
Originally Posted by Ole
The more critical issue is evenenss of development. That is the thing I am always most concerned about with stand development.