I suspect there is a leak in your system.
the Aquatek is a preset output pressure, I heard it is at 50psi(not personally own one), it is a smart thing to set the output pressure at 50psi because higher pressure can push through the super ceramic diffuser which is around 30psi back pressure, and higher output pressure at 50psi can increase the pressure difference in the whole system, thus flow rate is more steady if the back pressure swing.
under 50psi regulator output pressure, bubble rate still inconsistent or shift, and require wild open on the needle valve to increase the flow so the bubble can pass through the bubble counter, there must be a leak somewhere before the bubble counter, most of the co2 leak through that leak point.
So you think when the bubble that is coming out inconsistent that means that I might have a bubble leak?
I remember checking when I got the regulator and there was no leak.
I'll check it again today.
The aquatek I used to have was set to something like 23psi. They all very a little bit but I haven't heard of the standard one being above 30psi.
A leak is also a possibility
My regulator shows that the PSI is one notch before to 40 PSI. So, about 38 PSI?
Question for those who has a Co2 system with the Super Atomizer diffuser.
Do you turn the needle valve more than you would if you had a regular glass diffuser?
Why I ask is because I have both ADA copy of the beetle glass diffuser and the super atomizer diffuser.
For the glass diffuser I only turn the needle valve just a little bit for the bubbles to start appearing.
For the Super atomizer diffuser, I would have to turn the needle valve at least 3 times or more than I would with the glass diffuser to get the bubbles to come out.
Is this normal?