The IgG test misses 8% of HSV 2 infections compared to the western blot
Far less likely with blot, correct. You will still make antibody even if you are not having symptoms.
No, not unless there is some significant question to be answered about the sample
If you waited 12 weeks from any concerning encounter to do the blot, I think you should believe the blot. If not, you could retest.
Terri