I just took them out today to turn them and do a little adjusting with the screen and the tops. I also rotated 180 degrees. Starting to show flowers already. Hopefully the worst of the stretching is over by now, because I'm starting to run out of room for all the tops in some areas.
I've started feeding it both the Canna Terra Flores and the Plagron Green Sensation Top Activator, with water on the third feeding. No sign of any tip burn, so I think I will start to gradually and SLOWLY increase the nutes, stopping at the first sign of tip burn.
In one thread about Scrog, it said after 2 weeks of flowering, its advised to trim all of the leaves and growth underneath the screen. This supposedly helps in air circulation, and no energy is wasted in the little popcorn buds. However, Scrog is already very unnatural for the plant, so I don't think I will be doing any trimming at this time. I'm gonna run out of bud here pretty soon, so I'll probably end up starting from the bottom again!