Inkaddict

Hello, With the cooler temperatures I noticed an interesting thing happening with my ceiling fan when I lowered the speed to the lowest setting while still pushing the air downward. During the summer this fan ran continuously on the highest setting with a little bit of wobble in it. With the the fan at the lower setting the wobble has increased so much that the pull chain now swings back and forth with enough momentum to connect with hanging lights. I suspect the cause of the wobble is due to one of the arms that attach the blades to the motor is slight bent, maybe causing a different pitch to one of the fan blades or there is a weight imbalance between the blades themselves. My question is what would cause the wobble to be more pronounced at the lower speed than at the higher speed scientifically that is. I'm sure that there are centrifugal forces in play here but could the directional forces created by the fan blades circulating the air be a stabilizing factor?