sow exactly does the water/airflow in your setup work? could you paint me a pic perhaps so its easy to understand. you have quite a few net cup holes there.... ive always thought that crowding my plants roots keeps them from being as bushy.
think of a forest; lush growth of nothing but roots tangled up in humus.....
this is in principle the same thing, but they humus is water.
the way this system works is recirculation by overflow. a pump pumps water into the containers from the res, and water returns through an overflow tube on teh other side. each container holds three air stones which are pushing a massive 134gph of air each.
because this is dwc, and roots are submerged, the roots can be a mat, and will still not be fighting for nutrients, as they are readily available to all. if you look at my "feet wet" thread, you'll see how well three did together, roots becoming one massive rootball. the six site also became a mat of roots, the container was about 2/3 full of them!
also, in theory this isn't several plant's roots tangling, it's one plant spread across the table (clones). if roots can sense another plant's presense (roots) then it should see another clone's roots as it's own....
i'm stoned, sorry