I was just reading Lum's on-line manual with exactly the same question and with
the same grape.

Since you get most of the color extraction in the first 8 days or so, waiting
another day or two won't make much difference. From what I read, tannin
extraction is more linear over a longer period.

Honestly, I think the slightly early pressing has some advantages anyway. I
think there's less oxidation, and the sooner in the carboy and off the gross
lees has some advantages, especially for a Lodi zin.

Lee