Yeah Howie if it truly is OG kush you will have some primo smoke and under those 1000W you should be pulling at least 2-3oz a plant, even without Co2...not sure if your running Co2 or not, but give them planty of room to get good light to all areas of the plant...
And WBW some say that OG Kush is the Chem 91, but that isn't for sure and True OG Kush isn't a kush at all, it is predominent sativa, but they also say through the many years of breeding and crossing that what we have today could have some kush phenos linked to the afghan kush or something... Either way if you can ever get your hands on a Pure OG kush you would not be disappointed... I wish i could share some of the Pure OG Kush i have with you guys it is truly a cali classic dank!
LG