confused on # of plants to grow for best yield

hello every one im new here, just lookin for some helpfull advice/tips .im doing an all organic soil grow in 2 4x4x7 ft tall (16 sq ft) grow tents under fan cooled 1000w hps each. i have a seperate area for veg under blue 54w t5's. how many plants should i put for maximum yield in a 4x4 tray? i dont have a ton of head room to grow em tall so i figured more plants would be better and just keep em smaller. i was thinking either 9 , 12 , or 16 plants per 4x4 tray leaning towards 16 with topping. i just want the most out of the yield without over restricting the roots. im using general organics nutrients and planning on growing either indica or indica sativa cross. what path would you guys take in this situation. thanks ahead of time for any help. very much appreciated.

o yea by the way i know i should expect between .5 and 1g per watt but i figure # of plants, plant height and pruning techniques should come in to play with overall max yield, so not sure what route to take. thanks again