ORIGINAL: Rafael23cc
Additionally, I recently saw a pair of medium priced carbon fiber blades that were warped and showed the same symptoms. On track at a certain RPM, but out of track at a higher RPM.
An addition to what Gavin suggested, if everything in the head is correct, then your only option remains the blades. I could not believe it until I saw it right in front of me. Brand new carbon fiber blades, just out of the package the night before.
Rafael