Clan boss stuck at Nightmare — what am I missing?

Genuine question, not trying to start anything. It seems to depend heavily on region, which nobody mentions anywhere.

Interested in the counter-argument if there is one.

Same boat here. check whether an overlay is running before blaming the game itself.

Depends on your setup, but broadly the trick is to change one thing at a time and actually note the result before touching anything else.

I went through this last month. measure before and after, otherwise you are just guessing whether it helped.

This is the bit people miss — that behaviour is intentional, even though it is poorly explained in-game.

Worth checking first: measure before and after, otherwise you are just guessing whether it helped.

That fixed it for me, at least.