1931 ford Victoria door alignment

[tpepin]

Looking for some advice on aligning the doors. I have read all the posts and understand shimming the cowl just forward of the A pillar. As you can see from the pics I need to rebuild the one bracket. It seems as though the canvas top is very tight do the ever shrink pulling the cowl rearward? I’m thinking of using a porta power to push the header above the windshield from the rear floor to see if I can get it to move. I have also checked the frame and it’s straight.