Oh my, Im so embarrassed.
The resolution is 1920x1200. It appears to be that the fonts are just oversized, or something, making all my windows look like something I used to work on back in the 90s.
xdpyinfo tells me that with nv I am getting 75dpi, and with nvidia I am getting 152dpi. By my logic this should make my fonts (9pt) appear half sized on nvidia when compared to nv, not vice versa as is happening. Ive attached a screenshot taken under each driver to illustrate.