Sandy, thanks for posting these results, which I imagine are useful to many.
If the differences between JandC and Bergger are, in fact, due to quality control problems, rather than intentional emulsion "tweaking," they are pretty profound quality control problems. In that case, I guess we'd expect to see extreme consistency problems in the behavior of different lots of these films. (In fact, variations of this magnitude--nearly 100% in developing time--would make these films pretty much unusable, at least to me.)
Has anybody who uses either of these films regularly observed such a thing?