I do feel that the data package for the Leap engined A321 is incorrect and Airbus needs to revisit it. I have been in continuous light chop in one at Optimum altitude and the autothrust was extremely sluggish and was doing nothing to try and hold the speed target. I now consistenlty fly lower if there is any cat alomg the route on the sigweather chart.
Pineteam, I am glad that you found it useful, lets stay safe in flight.