Yeh, maybe. I don't believe they are too stiff though, but that could definitely be me messing them up. I did shoot some bareshafts yesterday as well (Gold Tip arrows but all specs the same as Eastons besides gpi) and they flew nicely. I need to keep working on my form and release anyway and figure I'm close enough where my flight looks good (got some footage on my camera and gopro) that I can stop worrying about it so much and maybe try a different recipe down the line.
I got some shiny new broadheads that I need to sort. I'll glue the rest of my inserts in shortly and try to have all the broadheads aligned the same way so my sight window is good and then go hunting.