Man you should be raking it in with two 1000's. Each one can easily cover an 8 by 8 foot. I would put them inline to get in between the lights. wish I had that much room. cooling is the biggest factor for water temp and keep a good air flow across the tops so lights don't burn them.

Man you should be getting a couple elbows easy. I had a 4 x 6 room and only use 4 x 4 with a 1000 hortilux and could get close to a pound if I starting flower at 12 to 16 inch plants in a drip system.

What kind of bulbs are you using ? Cause when I went to hortilux it almost doubled what I got. Sunmaster is good too.