you want to drop your nitrogen levels during flowering. and you might want to stop using ferts more than one week before harvest. i flowered for 8 weeks on my last harvest, 5 weeks with fertilizer and 3 with water. i flushed every other watering in the last 3 week and also used some molasses in there.
cutting off the ferts earlier and flushing heavily makes for a tastier and much smoother smoke

hope that helps

happy harvest!