I'm not a drama teacher but could all this problem with the grades be caused by a statistical error? The written unit is out of 120 but pupils only had to answer 2 sections each of 40 marks, so maximum 80. Was it then modified to be out of 120 and were only some of the marks not modified? This would explain the very low marks. A basic error rather than needing all remarks? Something clearly is badly wrong and needs addressing quickly by AQA to restore confidence.