Yep looks like there aren't many if any amber trichs yet. I'd agree that you have 7-14 days to go still. I know that when the fan leaves start crinkling up like that it can make some people panic and think they need to harvest early. Don't worry though, that's just the buds taking the nutrients (N mostly) from the fan leaves and is normal. (Just like the leaves in Fall!) Hang in there, patience pays off big time in the last couple weeks of nug production.
-Personally I'm not a fan of flushing at all, every other farmer in the world out there harvests at the peak of production and taking away their food the last week when they need it the most doesn't make much sense. But anyway I would definitely add some molasses to your water (heat up a cup of water in the microwave and add 1TBS per gallon of water that's going into your watering water) once a week. It gives the nugs a nice little carb boost. Black Strap is best brand name to get if you can find it but any works about the same. =)