I think it would really help both in terms of outcomes as well as the perception of police if they gave this kind of clear description of what's going to happen. As it stands now, the curfews aren't enforced with any kind of regularity, so they just cause confusion.
As someone who has participated in protests for 5 out of the last 6 days and was tear gassed, I can tell you that protestors are much more peaceful when the cops keep a distance. Once the armor shows up and the tear gassing starts protestors get angry.
I think curfews do have a place when there's massive looting happening and the police need the streets clear so they can prevent it, but there hasn't been enough looting in several days to justify curfews.