Honestly, these concepts differ from how I was trained and how I teach them. If there is a reason to treat the own stem, this indicates that the person is affected in their own qi, which is a serious condition. The appropriate approach in that case is to use the Great Movement mother point (see my book) provided this is confirmed by pulse diagnosis. In most cases, this confirmation is indeed present. (Assuming that the diagnosis is correct)
The application of Unlike qi is used to balance the Great Movement. Unlike qi means that two Unlike qi are housed within the same Great Movement. I trust that I have already clarified the treatment via the Ke cycle in the other question. As my teacher always said, a treatment only has meaning when it is confirmed by the pulse. Best wishes, and thank you for these questions! Joan