Thanks for the info.
I wasn't aware of the variations in testing standards. I guess that makes sense, although my very unscientific experience with both Neopan 400 and 100 is that after 4.25 minutes in SPD the results do not look low on contrast at all. If anything this is a slightly punchy film with very distinct contrast. And yet when I process it for over 6 minutes in D-76 I get what appears to be similar contrast levels...

But I do need to do a few more rolls in D-76 to really get a better idea of the results.