Just make sure the amber is on the calyxes, not the sugar leaves, Amber shows on the sugar leaves 2-3weeks before it does on the calyxes.
Quit watering them 2-3 days before you chop them, I always put mine in the dark, for a day or two, also. But I can't swear it helps anything, on our outdoor grows, we'd put huge black plastic bags over them, sometimes for 3-4 days,
Good Luck with your harvest.