Hi Defacto: No, there is no difference in roll rate. Because of the flight control laws roll feels the same in either configuration. Flap angle for config 3 is 20 degrees for all 3 models in the 320 series. Flaps full is 40 on the 319, 35 on the 320 and 25(!) on the 321. Landing config 3 is like landing flaps 20 in the 757 or 737.
We have had issues with our East based flight crews tail striking the 321 over the last few years. We have had a lot of read file items and handouts placed in our mailboxes because of improper flare technique and poor energy management. Somehow the east pilots have gotten the idea that landing with power on and not flaring is the way to land a 321. The subsequent bounce proves that theory wrong. The opposite is also happening, they pull power too soon and pitch up past 7.5 degrees where they get the "Pitch" warning callout. We have had zero tail strikes for PHX based crews (there are 1200 airbus plots based here), not sure why our technique has evolved differently from theirs. We mostly use flaps full landings and only do config 3 for abnormals or proficiency.