If it's a day one release in black or gun metal then you have a faulty tank if you tried every wicking there is, some off them don't seal where it is pressed fit.
I have a thread of it here :
Zeus X Rta flooding and dealing with geekvape
There is a fix for it the vid was posted in a couple of msg above, but make sure you have tried all the ways of wicking possible.
Let me make it clear this is not a fix for every zeus x that is flooding or spit at you once a month ago, it must have the gap in the top chamber !
Mine was a lost case and i can see the gap in the top chamber is not pressed fit 100%.
Good luck on this mine almost drove me insane before i found the problem, quite a few zeus x in black and gun metal have this problem loads of threads around the net about it.
Try the wicking again like someone said here if you wick it 10 times wrong that doesn't make it right, try keeping track how much cotton you use at a time, start from very little to very thick and everything in between, sometimes to much wicking can also cause a problem.
Also tried every o ring 2 times over, first the black then the white and last the orange nothing helped me.
Also the tap it with a hammer is not a permanent fix, i did it with mine and for 3 weeks after that it wicked like a champ and flavors for days, but it was short lived about 3 weeks later flooding started again so had to go tap it with the hammer again, so the tap with hammer is just a temp fix, anything i have to take in the garage and tap it once a month with a hammer i don't consider as working