wow I feel for your problems dude. I am a Novice perfoming my first grow and my baby's from seed started in hydro and had probs switched the survivor to dirt and its thriving now but so far 7 nodes (Pic below of the lone survivor) still got a while to go.

Anyway for the home made CO2 your using i did do some reading up on this and am wondering if your changing out 1/2 the solution and refresing with fresh water and yeast either daily or every other day not sure off hand. from what i hear if you dont do this the solution gets rancid and Im not sure if will effect your plants.

Also are your temps high enough for CO2? from what I understand unless your lows are 85 and highs around 90 CO2 fed plants thrive in that temp range with CO2. and have you increased the feeding, I'm to understand the nute requirments need to be raised to a higher ppm?

Now mind you like i said above i am a novice and I know you could get better advice and input from those with a few years under their thumbs. but since they didnt chime in yet I hope what I said gets your grow going in the right direction. finger are crossed for your babes as well