Yo Katie, I'm actually going to flush them for closer to 2 weeks. I made the decision once I saw that my buds were getting very filled out yet the leaves are still lush green, and trichomes are still clear. I want as much of the stored up nutrients in the leaves and buds to get burned off. I started a Clearex flush 2 days ago and am just going to be adding Ph'd water from here on out. They are still drinking about 1.5 gallons per day.
Also, the idea of the screen/scrog was to spread the branches out as much as possible and hope for less vertical growth in my limited height area. However, I now realize I wasn't as aggressive with tying them down and bending them as I should have been. From my journal you'll see that I was overwhelmed by the continued vertical growth, even 3 weeks into flowering. Luckily the addition of CFL bulbs has allowed me to spread more light around and the results are better than expected.