Thanks for sharing real numbers, that's rare. A 2.77% reply rate with 10 positives is a solid base, and 1,047 emails is a small enough sample that I'd keep testing before changing everything. Looking at where the 9 positives went cold, the drop-off seems to come after the 3 concepts. A smaller next step might help: send one concept only, or a 60-second Loom of the best one, so they have less to review. For the two who asked who you are, a one-line proof point in the reply (a result for a similar brand) could answer that before they ask. And I agree with your point that a brand running 40+ ads may not want concept ideas, so a CTA about their ad performance (creative fatigue, a specific drop in their ads) might fit that segment better.