When you lift up on the open door, a very little bit of "slack" is normal. If the door is low enough for the latch to drag, then the bushings in the hinge need to be replaced. As I recall from the FSM door adjustment, seems like when the door closes, it is supposed to "lift" up slightly?
UNTIL you get the hinges refurbished (hinge pins and bushings), as you close the door, lift up on the handle rather than just slamming it harder (which might also make it spring back as it resists closing).
We saw a LOT of worn hinge pin bushings on 1980s and 1990s Chevy pickups. Enough sales that they are even in the aftermarket!
When you get the bushings replaced, lube them, too, then LEARN to not push down on the inner armrest as you open the door. This seems to be an unintentional action, from what I could determine, as you want to get the door open and use more force with the forearm. While also pressing down on the armrest, too! Go ahead and use the forearm/elbow to open the door, just do NOT press down on the armrest as you do.
On a related note, as you approach a building door with a crossbar to push it open, almost everybody will use that crossbar to press down on the door, as they open it. As if they are expecting it to resist their opening efforts, so they press down with more force to ensure the door opens for them. In this case, just push through on a horizontal plane ONLY and see how much easier it opens, usually.
Just some thoughts and observations,