I have had a long spell of developing 35mm HP5 in D76 at 1+2. I give it 15 minutes and like the results a lot.
Recently I tried 35mm FP4 in the same mix for 14 minutes. but had to print on grade 3.5. So 15 minutes may have been better, though this, of course, depends on how much exposure you give.
For FP4 I think Perceptol at 1+2 is a much better bet. My negatives developed in D76 were noticably grainy. Little different to HP5, in fact, in terms of grain and sharpness. But FP4 in Perceptol 1+2 is much better; sharp and fine grained. I think HP5 is slightly better in Perceptol 1+2, in terms of grain. But if you don't mind a hint of grain D76 at 1+2 gives very sharp results with HP5,along with great tonality, and negatives that are very easy to print, in my experience.
Alan
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