Yesterday was better. The key seems to revolve around the higher daisan, with the arrow parallel to my shoulder line and (necessarily) closer than before. Also as an experiment I’m putting my right middle finger a little further out on the thumb. Get past that first urge for release, then focus on sending the right hand straight out, fast and far at zanshin. Sometime after that, an arrow flies. Somehow. Need to check with K-sensei about the right hand thing, though.
A lot of students are back at the dojo after their summer break and whatever else they were doing, so the place has become very nigiyaka as they all catch up on what each of them did over the break. It’s a bit jarring after such a quiet September, but a good way to strengthen concentration!