Final push lighting, feeding, flushing optimization opinions??

I would say you're still not close to harvest here... pistils are still mostly white and your leaves haven't started to turn color. Best thing to do is to get yourself a loupe or a microscope so you can get "up close and personal" with the trichomes to see what state they're in - and make a decision as to what kind of effect you want to achieve... if the trichs are clear, you aren't ready at all... if they're milky and you harvest, the effects will be more cerebral... if there is a small percentage of amber showing, you'll get both cerebral and body relaxation... if they're predominantly amber, you'll get couch lock (and the THC will be degrading). Hang on... keep your water/nute/water/nute schedule ... a lot of folks don't do a hard flush at the end - there are purists who will tell you if you don't flush you'll get a harsh smoke but... If you're concerned about a harsh smoke, give nothing but water for the final week, that will allow the nutes to "flush" out of the plant. Last minute tricks? Yeah, I don't believe there ARE any... just be prepared for your trim jailtime! Know whether you're going to wet trim or dry trim... you want a nice, long dry time - keep them in the dark at about 60-degrees with 60% humidity and a fan that is gently moving the air around them (not AT them)... Good luck and enjoy!