Meta's automatic creative enhancements (cropping, brightness, generated text variations) are on by default in a lot of accounts now. For anything with a specific brand look or a founder on camera, I'd turn the generative text and visual tweaks off. The system will happily rewrite your headline into something that sounds like every other ad in the feed.
For cold prospecting, where you're testing hooks anyway, leaving the crop and format tweaks on is low risk and can help delivery across placements. The catch is you won't know which change helped unless you run the enhanced and original versions against each other. Has anyone split that test with enhancements on and off, and did conversions move or just CTR?