I’ve taken a few pictures of my bike as a reference. The gaps around the headset look pretty extreme in the photos (angle).
During installation, I didn’t have any issues, especially not with the compression ring (was flat). I tightened the headset bolt very lightly, around 1-2 Nm. The result is that there’s absolutely no play between the frame and fork – I’ve tested it by pulling both brakes and moving the bike back and forth.
The steering also feels smooth and easy, exactly as it should.
Everything "feels" as it should, as if the bike is functioning exactly how it was designed to.