Thanks for the responses. While it is understood that thicker e-liquids would have a harder time wicking, I have used this same juice in punched cartos at another time and they worked fine. I have heard that it is important to get the right pressure in the tank, but I am not sure how to fill to make this happen---and can't find the thread that might explain the process---any advice?
This is going to be long. I'm sitting in a hospital bed with nothing better to do but prattle endlessly on.
Negative pressure (vacuum) in the tank is generated by two things... the vacuum you create when you take a draw, and the vacuum naturally increasing as fluid level drops. The wicking material serves as
a "seal" of sorts... with a slow leak. ;-)
You'd know fairly quick if you had a real, full time "air leak"... the carto would, to one degree or another, flood.
You can actually improve flow - temporarily - by forcing out the vacuum in the tank. Temporarily opening it to the atmosphere, or, less effectively, capping the 510 end and blowing through the drip tip end. It goes back to "normal" within a few draws though. Just letting it sit on it's side for a few hours or more, with a wick hole uncovered by juice, can have a similar effect.
As Bad commented on, there
can be winners and looser in every box of cartos... and all in between. Boge quality control has improved dramatically so it's more like (IMO) 5% that's a bit sketchy, rather than the "good ol' days" where 30% were complete crap. Considering cartos run only $1-$2 ea. and are disposable, recent longevity and quality has been pretty darn consistent.
As has been said by a few already, the thicker the juice, the poorer it tends to wick. Bigger or more holes - longer slots, all have a case of diminishing returns. IMO - You could have five 10mm slots, or 4 3mm holes... and it wouldn't make a bit of difference once you've reached the juices wicking potential.
I've got a Ikenvape 2X3mm Platinum (made by Boge to Isaac's specs) in one 22mm IBT right now that's not living up to typical Ikenvape standard expectations... vapor is weak, flavor is only OK.
In another IBT is a Boge 10mm slotted carto... and it's just a few degrees away from a Kayfun or Russian for flavor and vapor. Both are filled with a 60/40 medium body/color juice. Luck of the draw, literally.
These days, when I install new cartos, I expect them to work up to the standards I've come to appreciate... but you still can't guarantee it.