I'm not concerned about the noise and as @72bluNblu mentioned, it isn't anything to worry about. I had poly bushings. I'm sure they give a little, but I'm thinking the bend in the shackle itself is where the deflection comes from. They are just a piece of flat steel with 2 bends, they are already weak laterally by design. Tire rub is the tell tale sign that I'm getting movement, so I had to do something. Those shackles are fine for 95% of people out there. I just found their limit.