Have to say Kondor I think you may be basing your opinion on one carto? Understandable - I was hanging on to my first carto and willing it to work properly before giving up and trying another.
I'm using 60/40 AG/PG and am having the opposite problem this time - I'm having to take a couple of quick hard cold draws (til I get a few air bubbles) and it seems it's not quite getting wet enough. I'm only having to do this once an hour but still, bit of a contrast to my last experience.
You could well have a coil gone too? Honestly the difference between this one I'm using and the last one is the difference between night and day. I'll keep you posted how long this one lasts, but on this performance, there's not a lot wrong with the setup.
I don't do the cold draws any more, I just give the tank a little squeeze (perhaps that's bad though) if I need too but in all honesty, I rarely need to worry about it. I do vape 80/20 PG/AG though which surely makes a difference. That's why I think it would be better if there were a couple of hole size options.
You could try taking the outer cylinder off the duff carto and drilling the hole out a little lordy, its not overly difficult to pop that outer off and swap them over but if you only have one carto left you might want to wait until you've restocked just in case it all goes horribly wrong
