Good, thank you guys.

I'm still confused about what I need to do. Now there is no washer or lockring between the upper race and the locknut, and even tough the headset is set too tight at the moment,
there still is at least 2 mm of unused thread on the locknut.

So I'm really not sure if this setup can ever be safe, or work as intented.
Also it's an aluminum headset, so the locknut is alloy which means it requires more threads for a safe fit, than a steel one would.

I still don't know if I should try to make the current headset work, or just get a new one with lower stack height.
I also don't like how a washer cannot be fitted now, as the headset is too tall for that.