I'm new to this, so any of the pros out there can feel free to correct me if I'm wrong, but I think you have two issues here. 1) it sounds like you don't have enough light to be using CO2 and 2) you need some fertilizer if you want to see growth, especially if you want to use CO2.
You don't even have two wats per gallon over your tank. If it were me, I would stop using CO2, plant low-medium light plants and at the very least put some root tabs under the swords. You could also try using some Flourish.
If you have your heart set on CO2, I think you need to upgrade your lights so you have at least 2 wpg and really research how to properly dose micro and macro ferts. I would check out the sticky on the fertilizer forum.