I could go either way on this.
I also have a reaction to perique, and it took me 17 blends (slow learner) to figure out that perique was the common denominator for this unpleasant reaction. The last perique I smoked, intentionally/knowingly, was wet, almost whole leaf straight perique that someone brought from a St James tour 2 weeks prior to that pipe club meet up. It smelled incredible, it tasted amazing...and I could not get past the first puff.
I could roll with the power of suggestion for the reaction to that last smoke, because I had figured it out by then, but the previous 16 blends I was in the dark.
I never smoked LNF because I came across those flakes after I knew about my reaction to perique, but I must have had a sample of the 507c at some point, because I looked back at my old reviews spreadsheet and it says:
'boringly bland, nothing wrong with it but nothing worth remembering.'
Judging by that poor review I am pretty sure that I would taken the time to have had a whinge and a moan if I had a reaction to it.
But maybe just believing it was straight virginia was enough to have no reaction to perique...
from a business perspective, often the boring and least romantic version of the truth is the one that is actually happening.
Maybe someone will be willing to send their 507c to the lab to get tested for perique!