I hear you with the problem of overwatering, but truth be told, the theory behind NTF is to maintain that nutrient/h2o contact with the roots at all times. Amazing if you have had success with on/off NTF in the past. Ive never heard of that.

I agree with the previous post about O2 vs. CO2. I oxygenate the roots and give the CO2 to the leaves only when the lights are on. As Im sure you know this, you might have gotten a bit high tech for your poor plants. IMHO I would save the "special" CO2 and just put a couple of small sugar/yeast reactors in with the plants during the light cycle. Someone else said it before, but CO2 is one of the last things to worry about. Get a system down pat, then add CO2. Trying to create "the best system" is what we have all tried to do, but doing it step by step proves to be more fruitful in the end. Keep your variables to a minimum and don't buy "special" CO2 when you're stoned