I spent months fiddling with my CO2 thinking I was useless until I found a tiny little hole in my line. My cats had chewed on the line, and it made all the difference...one minute hole will kill your flow...
One other thing to consider may be your yeast, I got a jar of yeast from the grocery store once, and all the yeast was basically dead...it wasn't my fault but the yeast was all dead in the jar, so maybe try getting some fresh yeast...
like I said, I fiddled with the recipe, and found one that works great...my setup is simple too...I have a 29 gallon, 2x2litre bottles running through a T connector and a check valve into a reactor in the tank..I have the bottles staggered by a week, so there is relatively homogeneous flow of gas. I boil a bunch of water, pour it into a 4 cup measuring cup and add a cup of sugar and stir it with a fork, making sure to keep the fork in there. This dissolves the sugar, and kills the bacteria that are in your tap water, and there ARE bacteria in your tap water...I also fill a one cup measuring cup with this boiling water...I let this sit for a few hours...and when its cooled down to barely warmer than room temp I add my yeast to the one cup measuring cup, and stir with the fork that was in the sugar water...let this sit for 10 mins, and stir it up and pour it into the bottle, mix it up and put my lid on. stirring with the sugary fork puts a little bit of sugar in the yeast water, which seems to help with the aerobic activation of the yeast...I run this into my reactor which doubles as a bubble counter, and I get 30 ppm consistently.
Fluval PEEEEMP #9
2xAC30 + AC MINI (it's Hagen; close enough!)
CO2 stuff c/o REX