Hi John,(posted 8420 days ago)I think you may be right when you say, "the curves I'm getting with new Delta 400 show a pretty strong shoulder above about Zone IX or so" I have not done formal tests, rather a lot of informal (semiformal?) ones and the result is that I found that being really careful to NOT overdevelop/overexpose this film gives me better results.
But being really careful is not how I always use 400 speed film in 35mm. I expect it to do anything I want, when I want, with minimal hassle - I ask a lot from it. (too much sometimes, I guess)
I just hung to dry some 35mm D400 shot at 400 developed in Divided D76. They look good wet. I'll write again after I have a better look at them.
btw:I enjoy reading your posts.
Henry