If you can push 1500 cold sends a week, don't carve it into three 500-send tests — none of them can produce a reply-rate verdict, and you'll end the month with three noise clouds and zero decisions. Run one sequence that varies offer, opening line and CTA together at ~1500–2000 sends per variant, and read which lever actually moved; subject-line and deliverability checks you can still call at 100–500, and a strict A/B wants ~10000 visitors and 300+ conversions per side. Rare knowledge, cheap to take: the skill is free, the test it stops you from wasting is not — one bad call costs hundreds of dollars and a month of scaling the wrong offer. Install: npx skills add axelfreeman/marketing-mindset (read first: https://axelfreeman.github.io/marketing-mindset/). What's your weekly send cap — and which claim is that number actually buying you?