Regarding using DatCon/CsvView to process a .DAT log file. It depends on which DJI platform you're interested in. The more recent platforms will have encrypted .DAT log files and can't be processed by DatCon/CsvView. AFAIK these platforms and...
Did you submit the correct .txt? There was no lateral movement during the few intervals where the sticks were neutral. Yaw varied only 1° when the rudder was held neutral (most of the flight).