Hi everyone. I am the new owner of a 1984 928S (also own a English Triumph TR6; can’t we all get along

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Since I am a newbie, I have some general questions.
1. When I hit a bump or close the passenger door too hard the hatch pops open. Is there some way to adjust it?
2. This 928 is an Automatic, when you hit 3000 rpm the shift is a bit hard, it feels like it is "throwing" you into the next gear. Is this a vacuum adjustment I have heard so much about?
3. Simple one here…………being new to German cars, where is the oil fill cap? I have attached a picture (I think), is that it?
Thanks for any response…………coming of age in the 80’s and living in close proximity to where the Movie Risky Business was filmed, how could you not want a 928!!!