There is most definitely something funky going on there. That shim on the bottom is pushing the back edge of the door at the bottom too far to the 1/4. If it went beyond the stop chances are the hinges got a little twist in them.
How I would do it for a customer is first I would remove the bottom shim and assess the gap again. What I think it needs is fairly simple. It needs to be lifted up at the rear of the door, while the hinge bolts are tight not loose.Tight meaning everything is in correct alignment. Meaning don't remove the shim and get the bottom hinge out of the alignment it's in, tighten and then try this. Everything needs to be fitting as good as it can and tightened up then then lifted/forced up. This would help correct the twist the hinges got when the door went past the stops.
First method I would try is to simply armstrong it, gripping on the bottom of the door on the back end. And try to lift up. Depending on how strong you are you might move everything enough that way to get back the alignment.
Keep in mind that the striker needs to align with the center of the striker plate for proper opening and fit. You may have to adjust the striker plate up some to get it in the correct location for that. Then you have to force the door up like I described in the previous paragraph. They make tools to this but since the striker and plate is slightly different from Japanese and Domestic cars most of them don't fit or you have to modify them to fit. This video is crappy quality and doesn't relate to a 911 but the principle is the same and you can understand easier what I'm saying if you give it a quick view.
https://www.youtube.com/watch?v=fV_NI6iBOIM
To do it with a 911 like that you have to modify an existing door adjusting tool or make something on your own. I have one that I made that works. Porsche's are essentially constructed the opposite of domestic and Japanese car with the striker in the door and the striker plate on the 1/4/body.
That is what needs to occur though. The door needs to lift up with everything tight and the striker plate in the correct position on the body. You may also find that you need to loosen the fender and readjust the gap at the top front as it looks tight in your pic and when you lift the door it will get tighter.
Removing the shims and simply adjusting things first might get everything in correct alignment if this indeed was a new door. The shim on the bottom is making things worse. But I think it will need some adjustment in the method I mentioned to actually get it fitting correctly.
I hope what I wrote makes sense. It's hard to convey in written words alone. Please ask me to clarify if you need to.