OK. I got my 4x5 last week and some holders. Decided to run a sheet of Delta 100 through it to see if the film was good. It was stored for four years in less than optimal conditions, including above room temp for seasons, meaning about 80F in the summer months.
Anticipating this I rated it for an EI of 50. I metered a gray card at EV4. Low light, low contrast. Highlights were at EV5 1/2, shadows at 3. So I went with the card, 1/5 sec at @f/8. My extension factor was 2 so I gave it 1/5 @f/11. And I just realized why the neg was thin throughout. Wrong way. Should have been 1/5 @ f/5.6. Yup, knocking off the rust here in Delaware.
So, the answer to my question? Pilot error. The film is fine. The HC110 is fine. Man, HC110 is high indestructible, right?
Thanks for reading. Pay no attention to the man behind the focusing cloth.