So I quit on that side and moved to the other. It was easy to weld on the fenders because they're thick metal with curves everywhere. Not so easy on long gently curved door panels, so I adjusted my method. Instead of spot welding the entire thing in and then skipping around to fill in all of those areas, I work one edge at a time, using hammer/dolly to adjust as I went. I think welding in the patch with all 4 sides at once caused warpage that couldn't be controlled. You might not be able to tell in the pics, but all of my warpage was adjacent to the patch. By only doing one side at a time and allowing the patch to move helped a lot (I think).
In the last pic this is the front of the door, so the dip on the right edge was supposed to be there
