I have two set of negatives (APX 100 and FP4) I would like to develop them using Pyrocat- HD with a HP Combi tank. According to your experiences could you please provide me a starting developing time for this kind of agitation (dip and dunk) for N-2, N-1, N, N+1, N+2. It is better to have plain water stop bath a weak acetic acid solution. At which concentration and for how long?

P.s. the APX 100 negatives are valuable and I am very afraid to spoil them since APX is discontinued. They have been all exposed at 64 ISO (I made a mistake!).

Thanks to all, folks