I'll add a few suggestions to that. When filling, don't let it "ride" the coil condom down, let it flow down the side of the tank. Try to keep them upright as much as you can. More than a minute on it's side, mine start to leak a little bit (Not to mention what happens when it is upside down).
Try doing these things, but only fill it up to around .8ml. When I hit 2.4 It starts leaking sometime, even though they say that 2.4 Is okay, I won't go past 2ml.
Your cleaning strategy is spot on, the filling not so much. When filling, really avoid that center post as much as possible, obviously because that is the peice that is moving the juice to the battery. Honestly, your best bet is to fill a tank (coil assembly and all) and fill it with water to 1.8-2.0 And just watch and see if you can find where it is coming out.
And, one last thing. I would advise never blowing into the tank while there is juice in it and connected to the battery. It is an okay way to clean the juice out of the center post, but I needle up a paper towel and stick it into the bottom of the post and soak it all up that way.
I had insane leaking and flooding problems when I first got mine, but trail and error (and everyone here) helped me learn what I was doing wrong. I was actually trying to fill the center post, because I'm short-minded like that
