Hi Jeff,
Yes, you are right about the strays of the test jig, and about the capacitor lead length. However, I am using the same test jig and capacitor that, although not perfect gives milli ohms resistance when using the DG8SAQ VNA and 11 ohms with the NanoVNA. So I am comparing Apples with Apples, and not with Oranges.
73 Stewart G3RXQ