Don't know if it will help, but try the condom method, which I've only applied recently and never did in all my two year plus use of cartos. I feel that the cotton, whatever it is, inside newer cartos is denser, unlike before where I could use it for a week or more. What probably happens is that the liquid, especially if it's thick don't get to settle at the bottom. Using the condom method will moisten the bottom part.
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