@ Machinbird, DozyWannabe;
This Rudder / Yaw Damper problem has been raised in the past. I have been looking carefully at the DFDR traces post stall and find that the heading is changing at a fairly constant rate (clockwise) when the SS is held over to the left for a reasonable period of time. This lead me to looking at the Inner Aileron traces, and I believe that the RH Inner Aileron when down was effectively creating drag, whereas the LH Inner Aileron when up was in the wake vortex and ineffectual. This drag on the right was causing yaw, and the the Rudder/Yaw Damper didn't exactly help, though in the same vein, the Rudder Trim was offset 0.4 degrees to the left which may have helped create the right wing down bias.