It seems well written to me, though that probably doesn’t count for much. It would be cool to get a hands on type session for this kind of thing going on. Using body tension to try correct a barn door, holding yourself when you come off an over hand etc.
The only thing I can think of that requires constant tension would be your shoulders. And tension is the wrong word for that. But not locking off your shoulders can lead to injury- think of how you’re meant to hang at the bottom of a pull up. Constant tension in so far that your joints are prepared to bear some form of weight- as you said, as little as possible.