Thank you each for your thoughts on this.
In response to David’s questions, no, I hadn’t heard of adjusting the 7.5 IRE to 0 — I actually don’t know what that is…! We shot on the Panasonic DVX 100 B… so I’m not sure if that camera has that capability, or not.
Second, the NTSC calibrated monitor was calibrated by a professional who does this sort of work all the time, but I can check and see if there’s a chance anything went awry.