I put a rear sway bar on along with the CHF and the safety steer. I also had an alignment done. At the time of alignment the safety steer was left loose. and after the alignment before the alignment equipment was taken off, the safety steer was reconnected. A big difference indeed. In the future I will most likely add the Sumo springs as well as Koni shocks.
I had many people point me toward the rear track bar but I felt the problem stemmed from body roll and sway which really said go with the Sway bar.