So at work (Honda Alabama assembly plant) the weld guys use a wedge made out of hard plastic to make adjustments there are even really soft rubber hammers they wack the doors or hoods to make final adjustments. I know they are pros so be careful. you can even use wood paint stirrers. when I see your door to fender I want to use the wedge and push the edge of that fender down. but when you do that it will most likely create a wind noise. the video is just a example I found and not my work place. Good Luck
https://youtu.be/6hEx-wgrdAw