It looks like the gap at the leading edge the door is tight. Can you move it rearward? That might allow the door to be raised a 1/4".
Don't ask me why. I had the same problem on one of my trucks and moving the door back a smidge allowed me to raise the door a smidge.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission