Jim, I had an electrode repositioned which was supposedly in the correct location.
Post op like you I had a CT scan which said so however I insisted one side was not correctly positioned due to going back to my original amount of Sinemet which wasn't why I had the op in the first place!
An MRI verified my opinion and the electrode was repositioned just 2mm and it made the world of difference so hang in there!
An MRI can give a better idea of position than a CT.