Afterwards, it is of course easy to say "Why didn't you bracket?"(posted 8860 days ago)From my understanding, the high contrast is normal in long exposures, regardless of whether the corrections are correct or not. This is understandable, too, because reciprocity failure becomes the more important the lower the light. The highlights might still be in a domain where reciprocity holds, and the shadows for which you expose, are deep in the non-reciprocal domain. As I would see it, the factors are OK if shadow detail is sufficient, but you should cut development to counteract the high contrast.