Frostback, I am going to the range this weekend and will try to work this out. My suspicion is that you are not getting enough rotation of either arm (the top of the humerus) in the shoulder joint proper and I hate to repeat myself but this is a function of the rotator cuff muscles. I am not implying that they are defective but may still be disfunctional due to lack of flex, lack of strength or simply lack of a functional agreement due to other postural issues.
Have you been doing the exercises? It sounds like we need to advance to some deltoid training which can be accomplished with simple bands and isometrics.
Please let me know about your training and I'll get back with you after I experiment a little off the tee. I think I'll get it more clearly after I fatigue my swing.
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