So, what did you end up harvesting?
I have a similar setup, four 600's over two 3x6 flood tables, 18 plants on each table in 5 gal Geo Pots in Hydroton. Im debating whether to ScRog it or not, it gets pretty crowded and the Blueberry is a beast at over 3 ft wide/tall and the GDP's on 2 1/2 ft wide/tall, I have to bend it and move the lights a lot to optimize penetration.
I had a customer say it was a pain in the ass to move plants or when he wanted to harvest. He drilled a bunch of holes on his same scrog frame and put screws in them so he can tie down his plants, its similar to scrog but everything is easily removed.
BTW, you can have multiple strains on the same table with the same res, buts its like communism, you can only give it enough nutes as the weakest performer will take =)
I pump my nutes in this fashion weeks 1-8; 1000/1250/1500/1500/1500/1250/1250/0