It will keep pumping out pistils, and they aren't always the best method to determine when to harvest as environmental factors can cause them to brown early. Too many brown pistils will deteriorate smoke as well. I could probably take it another week or so but it's my longest flowering strain in a room that is primarily fast flowering Indica doms and I have to clear the room for the next cycle.
It cures up nice and dense though with good smoke.
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I would upgrade your lighting if you can afford it. A 315w CMH or 320w LED (white samsung diodes or COB's) is perfect for a 3x3.