I would triple check again to ensure you don't have any leaks. If there is one, chances are you have more.
Another possibility is that your CO2 setup is still not generating enough pressure to push through the diffuser.
Okay, I thought the same thing to check for more tiny leaks. I also went to buy some aquarium tubing since it is smaller in diameter (originally I had the 1/4 diameter bought from HD, just next size up not much bigger) and maybe I will have more of a snug fit.
Did you check around the caps themselves for a leak? Not knowing what kind you are using of course. I had issues with 2L bottles and thus changed to Ocean Spray. Much, much better seals.
Anyway, if you have broken the seal on the bottle to correct anything, it can take a bit of time to regen. Are any bubbles coming out of the seperator bottle?
Another good way to check if things are moving along is if you have clear(ish) tubing and have a small amount of water (drop or two) in the tubing. The pressure will move the water drop along the way.
* EDIT * DUH...Didn't see the mention of the Heinz bottle until I re-read it. Curious to how good of a seal you will get with those.
I am going to try either a 2 liter bottle or get an Ocean Spray bottle. I want to eliminate all leak possibilities. Do you think 1 or 2 bottles will give the pressure needed to push through my diffuser I mentioned in my op?
Money could be an issue, but my 2 cents is to start saving for pressurized CO2. I know some people like them but for me I had nothing but problems. Cloudy water, yeast getting into the aquarium, BGA all over the place & yes leaks. It is messy time consuming & unpredictable. I almost gas fish on several occasions. The ph can be unstable which is related to under fertilization or over, gassing. The bottles can explode as well making a bad mess.
Now I know there will be defenders of DIY coming to join this thread soon & all I have to say is I would never go back. My tank is stable ph is good ,crystal clear water & thriving plants with NO ALGAE. I would never go back to DIY. I do not worry about any CO2 related problems anymore provided a good diffuser or reactor is being used. If money is an issue I would save my pennies. If that sticky mess gets into your aquarium you will be sorry. Carbon filters should be inline before aquarium to help clean out unwanted yeast from getting in the tank. Most of the time even if no leaks are present the system will produce too much gas or not enough. The money you spend on yeast & sugar is more than the money spend on your yearly Co2 gas!
If I could have one, trust me I would already have it, since I cannot at the present time and do not know when I can, this will have to suffice, my plants cannot wait till my pockets allow it. I am using a check valve on the line from bubble counter to tank so I don't fear too much. But you said you were getting too much gas, did you change your recipe with less yeast? I heard that's all a person have to do if that happened. I do not know, I am new and learning so I have concerns, questions, doubts, beliefs that could be wrong that I want to address as I am learning.
I want to thank you all for taking the time to reply and suggest things from your experiences..If anyone has more thoughts, ideas, questions, and or different experiences good or bad please feel free to tell your story it may help me and others with our setup...