Perhaps it was because they ran the Proton/Neutron Tangents at the same time...It's the only disc they have done this with so far. Whatever it is, I definitely agree that the Tangent is very similar in the two plastics, more so than any of their other discs.
Hmmm. I bought a FR Tangent and mine flew like a Buzzz out of the box. It still has an ever so slightly fade at the end.