with that space and light you can do whatever your heart desires... I perfected the sog and scrogg only cause I have limited verticle space (5.5'), and I wanted to get the most out of my lights I get massive yealds and "only" large colas, but in the sog I have 160 plants in a 3x6 tray nuts huh? (9 plants per sq ft) im curently working with the scrogg method to keep my plant numbers down (18 plants in 3x6 tray). problem there is I have to veg longer. toss up, but fun playing around with different methods. personally since you only have 7' h tent stick with what you have 9 per light should work great. I would lst them ladies so they grow fat and stay resonably short... good luck with whatever your final plans are. show some pics. im gonna sub in to check you out later..
cheers