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Pro firebirds are not really desirable. They are not that overstable to start with, made with a normal pro blend and don't hold up well. Many were FLs and chunk very easily. I don't know anyone who throws one but I would bet there is some random dude out there who likes them and will buy them.
This is from way back at the start of the thread but I just wanted to pop in and say all the football players at my school got communication degrees because it was the joke degree that required no real work.
How are you storing it? It is in your house or out in a garage where temp changes can affect it? How are your discs stacked? Are you sure you didn't just forget that those discs were flippy? If that teerex is unused how do you know how it flew before?