Featured Image duplicated within a post even when -Don’t use first image ticked

I have been using Echo RSS for some months now and although it works well (when it works) there a a few problems that are taking at least 2 - 4 hours of editing between 2 people a day. 1. The featured image is duplicated in the post if the same image is the featured image. I saw your video (in answer to a previous question on the same topic) about this but it looks like the "strip featured image from content is not now there" but a different option called "Don't use first image in content" seems to have replaced it. I used that on the site tnc.news but it still brings in the duplicate image. I will list each of the problems in separate posts to make it easy for others to find the same answers