I've been using Boge cartos without a flange because I didn't want such a gap on my Stingray clone. I also found that the flanges scratch my mod a bit. I really don't like them as they taste bad to me and I won't be reordering them. My issues is, that the Boges seem to leak a bit onto the contact. I had a little leakage from the flanged Smoktechs, but not as much. I just pulled my mod apart and found that, this time, it leaked enough to get some fluid on my Kick. Not good! I've used a couple of tanks/cartos with different juices, with different viscosity, and they all leak some. I'm not sure if the leakage is coming from the vent or from the tank/carto O-ring. Is this normal or is there something I should be doing differently?