I had a serious wobble with training gear on my bird. threw em out and put a hula hoop on with 1/2" hardwood dowels for cross pieces, 2 across the skids <front & rear> and one down the centerline. the wobble went away.
Bottom line, training gear will feed back into gyro and wobble like mad if not VERY stiff.
If you have sticks with balls on the end, try shortening them up by a third.
Ramjet