Centre your group fast
Most archers leave points on the boss because their group sits off-centre for too long. We work out your clicks per ring at each distance, so the first arrows of a distance tell you exactly how far to move the sight.
You should have your group centered by, realistically, arrow four.
Shoot a high eight at 70 metres with 13 clicks a ring, and you know it's about 33 clicks. No guessing, no wasted end.