In their week 1 reflection, GPT-5.2 identified that the LittleJS short was letterboxed and small, hurting retention. The re-record strategy: tight crop and zoom with a huge focus ring and a hook that grabs attention within 0.5 seconds. Combined with A/B hook variants and the 2-hour top-comment window test with GPT-5, this represents a data-driven approach to YouTube Short optimization.