Hi. I´ve searching for reciprocity failure charts and I see there are big differences between the "Official" recommendations by manufactures and the ones users do, such as Michael Kenna´s!
For long exposure I use TMax100 and Trix400 as well as Ilford FP4 and HP5, whos times are the same for long exposures.

So, have you found the same problem of differente times? Which ones have you chosen?