I afraid that if you found that magnets were at stator, then something happened during flight or so. Any misalignment will amplify that problem. I do not know how AIX, but MVVS uses dynamical balancer (like tires on car) I do not think you can balance it at home. I would say take another motor.
Just for info - the magnets are strong so typically you cannot feel radial free play on bearing, even if it is weared out. But you can make a trick, add thin washer, to those on front side of motor (stator side). It will do the bearing fit tight, and try if motor still does the same. If it change something, then you have free play on bearing. If not, bearing is probably OK. But do not run it long time, because that tightness can damage the bearing. However I would say that in this case the main problem is bent rod, or the bell.