I used 4 gallon pots for the 3 plants but only about 2 1/2 - 3 gallons max of soil(pots were between 1/2 & 3/4 full). I also used a 400w hps light like the one you have. I didn't use any side lighting however i did use Mylar. Mylar makes a big difference! Try and keep all your pots nice and tight as well as the surrounding Mylar, the plants love it. My main colas weight in at around 1-2 oz. each right now but they are still fresh and moist. Not sure what the dry/cured weight will be, we shall see.