I had similar issues juddering at light throttle around 1800 to 2000 revs, frequent like you re regens, no codes and dealer who would not believe anything was wrong due to the juddering being intermittent. Finally they agreed that it must be mechanical so agreed with me that EGR valve was prime suspect. They replaced it and its seems to be fine now, normal regens and no juddering thats some 7,000 miles ago!
Edited by: volrider
2015 Antara 2.2 Exclusiv 2WD Manual 163 ps Carbon Black