Hey guys, I have a ‘22 High Country duramax, 21kmi, and was noticed a slight shimmy under braking. I’m really sensitive to shakes and rattles so I replaced the front rotors with AC Delco Gold rotor. The shake is still there under braking. Could it be the rear rotors? I thought it might be impossible to warp the rear rotors. I tend to be a little hard on brakes, my last truck was a ‘21 AT4 with 27k when I traded it and the shake was pretty bad. Any ideas? Thanks.