Whether it floods or not depends on how thick your
juice is and how big/many the holes in the carto.
One hole cartos are only good for very thin
juice, no more than about 10%VG.
If it's thicker, you'll need to enlarge the holes, or get a two hole or even a three hole carto.
Do yourself a favor if you get a dual coil tank. You don't need to use a dual coil carto with them. Dual Coil Tank is just a name. Go to madvapes and get some 1.7ohm tank cartomizers. An eGo doesn't have the power to run a dual coil cartomizer and it's a strain on the battery to boot. You'll drain your battery faster, strain it more, use more juice and, in return, you'll get a lot of lukewarm fog instead of rich, warm vapor.