I never heard of Halifax wing structural problems, nor of any with its transport successor the Hastings which used the same wing-engine-undercarriage package. Your trials might have been the major tests about 1943 which followed a series of stall-spin accidents. I think they found that the starboard fin and rudder would stall under certain airflow conditions and the empennage was successfully modified to avoid this.
The problem might have been mentioned by Reg Levy in his posts seven or eight years ago?