Running similar setup, chopping later this week. Started with 9 silver haze, 1 great white shark, which was way too much for a 4x4' area. I could've gotten similar yield with just 4 or 5. Mixing the Indica with sativas was also a big no no since the great white got buried under the others. Side lighting saved the day.
I have to say though, running more light/sqft has made all the difference. 1200w/16sqft = 75watts/sqft. It's actually closer to 100w/sqft since I'm only using a 3x4' of the 4x4' space.
I'll post my final weight when everything is dried and cured.