Fred, seems like you and I are in the same place golf-wise. I've always had trouble getting my lower body to really move through to the left, and with the bending of the left wrist at impact. Luckily I found a teaching pro who provided me wih some very good drills that have helped me IMMENSELY in getting my weight transfer correct.
We are now working on the proper release, as I tend to let my left wrist bow, and scoop a bit causing to high a ball flight. The drills we are working on for that have been a bit harder, but I can see the principles and the results.
Basically, what I am saying is, the best thing for me was finding a pro who was able to effectively find the way to get my swing work for me... You should perhaps stick with the lessons if they have worked so far.