I'm techinically and graph challenged. I look at those film graphs and I don't know what they mean. But I'm willing learn. All I know, is that, when I use tri-x (35mm) and I develop d76/1:1 and shoot it a 200, great grain. Lovely tones. ***BUT***, when I have to print a neg with sunny highlights, I have a hard time printing the highlights. I love the negs on midtones. So does that translate to the shoulders or toes? When I process Delta 400 with PMK, I don't have a problem printing the highlights. What does that mean in relation to the shoulders?