I really liked D-76, and when I had a commercial studio used to mix it
by the gallon. I eventually quit using it because I found that when I
didn't use it up reasonably quickly it would gain strength sitting in
the jug, causing unpredictable development. I switched to T-Max
developer and mixed it as needed, when needed and was happy with the
results.
If course, that's all ancient history now!
Dave Jenkins