Quote Originally Posted by Michael R 1974 View Post
...but this print/scan looks as though the negative is quite thin (ie underexposed) and also possibly underdeveloped....
Then the solution would be to find out why the film didn't get as much development as it needed.

Since you got the time right...

Check the D-76 developer temperature isn't/wasn't/couldn't have been too cold (if so, warm it up to 68-degrees F).

Or maybe it's just that your shots were in flat light (was the crowd shot on an overcast day?), in which case you would expect to print on higher grades.

I'd go back to the Ilford reference on post #3 from Michael R 1974. To simplify while things aren't going well, simplify. Use the single filter settings chart. (Adding Yellow doesn't help higher contrast grades).