Large Buds?

Hey guys I've got a few harvests under my belt and consider myself a good cultivator. My growing method is DWC bubble system in 5 gallon buckets. I use BC technaflora nutrients with their bud enhancer "Awesome Blossoms." I flowered 9 plants that were 15 inches tall at the start of flower using a 600 watt hps enhanced with a blue specturm 95,000 lumens. My yield was 5 ounces. I see a lot of people yielding a pound with a 600 watt light. My buds were larger than when I harvested with a 400 watt hps but they are now where near the size they need to be. I have the temps between 70-75 and i didn't alter the humidity at all and I've got two 250cfm fans blowing air in and out all day long from outside. I want to add co2 b/c it will increase yield but I think I should get to a point where I can yield at least 10-12 ounces without it right?

What do you have to do to yield more? I know this is a question that's prolly hard to answer but can you guys post pics of your nice buds and your grow room stats or maybe a link to your grow journals.

Thanks!

You'd have to go balls out with co2, full climate control including humidity and res chillers, and 4kw of light per plant.
Beyond that you could turn your system into this:

http://www.thcfarmer.com/forums/f95/doubleds-med-patient-bucket-diy-mpb-buckets-7883/index7.html

wow man thanks for the reply and that's a link to an awesome grow room!