Some carto's are just bad, from my limited experience.
But sometimes you can salvage it by re-seating it in the tank. A lot of the wicking has to do with pressure in the tank. If you put your tank tool on the carto, push it down into the tank, then re-seat it back up to normal position. A lot of times, that corrects the problem for me.
I find that having the top of the carto sealed, as in with a closed tank tool, works best.
If I use the open tank tool from IBTanked, the carto immediately floods and drips liquid like a sieve. I'm thinking it has to do with the amount of negative pressure in the tank because of that. So now I always use a sealed tool like the Slap Yo Mama or the one from Phiniac.