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Any suggestions?
I had some good success with a bench vice. Clamp the pedal really hard, and then stick in a allen key socket connected to an extension bar, as if you were to try to take the pedal off. Give the back end of the extension bar a good few whacks with a hammer. I found the shock and vibration unbound the pedal.
We don't know how sensitive you are. The change in Q factor is significant, but it's of the same order as switching from road to MTB.
I'd be surprised if a pedal was properly stuck in a crank that new unless it was either damaged or had been at the bottom of the ocean for a few months.