Just wondering about your 40:15 ratio...
Do you have some CartoTanks that the 2-holes work best in and other CartoTanks where the slotted work best?
Or do some juices work "best" with either the 2-hole or slotted?
(Or...do you just like to replace your cartos in a ...2-hole, 2-hole, slotted...rotation?)
I can say with complete certainty that with some tanks, the slotteds are just the Kat's Pajamas. (No offense to me) (None taken)
For example, when I was first using kartos in the Billet Box, the feed was minimal. I spent a good 1/2 year not even liking the vape on it. Then the slots came into being and bam, really good feeding and excellent vape.
My vliquids remain at the same percentages, so I can't speak to that from experience, but from common sensicalness, higher VG is going to feed vastly differently that higher PG.
For a true Karto user, it's always a good idea to have varied sizes in feeding ports.
But then again.... this is a KLEARO thread. Sorry.