Although I didn't write the original post, it mirrors almost exactly my experience so far with the NSA poly.  The more people that I talk to, the more common it seems.  I know plently of people that have had to go back multiple times.  I would venture to guess that multiple "failures" are more the norm than not.  My theory is that since Sep. 11, the window that they use for no-deception-indicated results is much narrower.  They might also be doing the multiple repeats as a way of weeding out the less motivated individuals.

I would advise AGAINST using countermeasures at this point.  If they see a marked difference in your charts as compared to your previous ones, it might raise suspicions.

It know that it is very frustrating, but hang in there.