asking the pros for help

ok well thanks for everyones opinion on the issue at hand ok so my grow room is pretty small in size it roughly 400 cu ft the demension are 8 ft wide by 7 ft the roof is 8 ft tall also ok so my equip is 2 1000 watts co2 gen and monitor any way im trying to get maximum yeild out of this space my idea is either running 4 2x2 trays with 15 5x5 pots with 3 1000 watts over em my strains are purple kush with widow and master kush 1 tray per strain a diff crop every 2 weeks is the idea dont want to get burnt out on just one kind ;0) so my question is will i be better off adding 2X4 trays to get more matter or use smaller pots on my 2x2's for more yeild everyones input is appreciated this is my 3rd grow and its been diff every time but im set on sog so please flood me with your opinions and suggestions thank you in advanced everyone smoke one for the cause......