Re: 1920x1200 via component out?
I didn't state that BFG doesn't do overscan adjustments. I honestly don't know whether or not BFG's cards provide this functionality. However the card that you're using doesn't appear to be capable of making them if the TVOverscan option has no impact, and you do not have a slider for overscan in nvidia-settings.
Its possible that a VBIOS update would change this behavior, however only BFG (if they manufactured your graphics card) could provide one.
Overscan functionality isn't typically something that is advertised on the outside of a box.