Here is a short glance:
Getting back to topic...
Jerry, the subject on your photo is not what Diafine is made for. The forest that you photographed has very low contrast. In addition, the grain caused by Rodinal is somewhat hidden by the structure of the trees.
Diafine is great when it comes to scenes with a lot of contrast: night shots, bands on stage etc. - that's what it's made for, to get as much ASA as possible in high-contrast scenes. It's not very suitable for scenes with low contrast because it dampens the highlights.
If you had tried the same film and the same developers with a street photo at night your verdict would be totally different.