I dont think the browning hairs tell you much more than alternating branches tell you about sex; they tell you that the plants is getting sexually mature, but not whether the first pre-flowers will come in a week or 2 weeks.
The browning hairs tell me its soon time to start checking the trichs, but not how ripe they are at all.

Hard to tell from the pics, but they look like 10-20% amber to me.