Hi, though I do not have an answer to your question, I wanted to connect with you given that you use DIVI. We use EXTRA, a derivative of DIVI and are curious if you have made progress in improving your Core Web Vital scores.
Regarding ad placements and making changes to your site, the Ezoic team has stated that the Ezoic WP Plugin, with its automated ad placements functionality, is more stable, i.e. less effected by site changes.