A couple of months I ago I had put in thinner cheek pads to see if it would improve the fit of my helmet. Then forgot about it. My helmet fit had loosened up so much that it bobbeled around on my head in the turbulence comming off the top of my Givi windshield.
Last week I put the stock cheek pads back into my HJC CL-SP helmet, and most of my head buffeting disappeared!!!