Getting black blacks with larger enlargements

[Bob Carnie]

Me too, I appreciate contact prints but really love 16x20 and 20 x24 from good negs. Easier to print as well.

True enough. A richly detailed and composed negative will often begin to "breathe" only as enlarged beyond certain minimum print sizes. It is primarily for this reason that I prefer the process of enlarging from MF and LF sources to at least 16X20 and larger, to contact printing (although contacts certainly have their own sense of beauty).

[Ronald Moravec]

You probably need 1/2 + grade more contrast paper. I always did.