I got the same setup, I love the 1000 watt too, but it gets a little hot, i think i'm going to setup a small fan blowing right between the top of the plants and the light.
seriously dude there are so many factors to how much you will yield.
AIR
if it's too hot in there your ladies nugs won't be dense.
Humidity can screw you too, Relative Humidity too high you get mold, RH too low the stomata close which stops transparency, no transparency no photosynthesis.
Seems like you will be fine on the CO2 with your
foxfarm packets never used them myself, just keep that air circulating in there.
the over all health of your plant i imaging will be a big factor, I like big healthy green fan leaves (take care of those fan leaves they are producing 70%+ of all the photosynthesis) and a pot full of feeder roots, not tap root. IMO the amount of feeder roots has a direct correlation to how much bud that will be grown.
my last grow i had a real serious ph problem and locked out N, and i lost 80% of its fan leaves. That plant produced only a 1/5 of what it usually does. The fan leaves are like the engine of the plant, when you have some dope fan leaves you know your ready to switch.
If this is your first op you should be happy with anything around 0.5g per watt.
