The replenished brew has become very stable. I decided to get serious and dialed in my personal film speed ( for Zone I ) and development time to get a proper print value for Zone VIII as per Fred Picker's method outlined in his Zone VI Workshop book. I am getting very consistent negatives with FP4 and HP5, all formats. They generally print well at about grade 2 ( diffusion enlarger ). Sharpness and tonality are excellent. I do proper proofs at grade 2, and include a Stouffer stepwedge on each proof sheet, to see things stay on track.
For my equipment and darkroom I have settled on ISO100 and 13 minutes at 20 degrees C of Xtol replenished for FP4. Your personal film speed and development time may well be different.
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