Optimizing Video Testimonials for Effective Cold Outreach

Hey All, I've got a problem I'm hoping someone here has solved before. I have about 10 solid video testimonials—SaaS founders and tech companies talking about specific results we delivered at Design Fervor (3-5x conversion rate improvements through product design work). These are genuinely good testimonials with real ROI numbers, not generic praise. But I can't figure out how to actually use them in cold outreach without tanking deliverability. Here's what I've tried:

Every approach I've tested either hurts deliverability or just doesn't get engagement.