A marketing test with 20 sends tells you nothing except that the plumbing works. Useful floors: 50-100 sends before you judge a channel, 300+ before you judge a message, and three weeks before you judge a cadence. Below that you are reading noise and calling it signal. Open source skill that encodes these thresholds: https://axelfreeman.github.io/marketing-mindset/ (installs with npx skills add axelfreeman/marketing-mindset)