Pictures would help me put my U clamps on like you have yours......Only thing I have done so far is torque the axle U bolts ... I am anxiously ready to see if the spring clamps helps me.
You don't understand how severe it is. Its sounds like your inside a subwoofer and the rhythm is the same frequency as the shake. Has nothing to do with cracking windows and relieving pressure. Cracking window you can hear it and further down the louder it gets..I don't ride around with windows down. I know what normal wind buffeting sounds like and this is not it.
I get really bad wind buffeting when I roll my back 2 windows down running 75 mph . It will shake the whole truck and is really loud. I think it is still buffeting with the windows up but I just can't hear it. I am wondering if anyone else has experienced that . I have a 2016 Sierra Denali 1500...I also have a bed cover to.
Mine work great on rural roads . I just leave it in auto and it does a great job. In town it sometimes gets confused with all the lights or it may brightlight a car pulling out from a side road. The auto feature is easily turned on or off..