The compensation should be enough to cause that kind of control response. The gyro effect is only supposed to dampen unwanted movement a bit, not to actually change the plane's attitude. I'd double check that the compensation is going the right way, as in a sudden left yaw created by you on the ground results in right rudder being applied by the gyro. If that checks out, maybe you have some up thrust in the prop? If the power off glide is good and the CG is right, I could see up thrust causing it to climb uncontrollably under power and would also cause significant P factor would could explain the left spins.