How much time have the training programs spent on the root causes of an ineffective selling system? How much time have they spent on discussing the importance of understanding the impact of 'need for approval' or a 'non-supportive buy cycle"? You see until you get to the root cause of a problem all you can do is treat the symptom. All you can do is run faster to get more results.
Try finding out what the root problem is and treat that as an infection. Get rid of the problem - get better sales results.