Guys I do run a pretty heavy VG mix in mine, trick seems to be also tilting you PV and making sure the wicks are getting wet to get a good vape, play around a little trying to set and tilt your PV a bit to see what works for ya, the wicks cant keep up with chain vaping on these things like some of us like to do (me) I'm like a Loco motive freight train vaping down the tracks so I keep like 2 of these filled with different flavors while also having another couple of PV's set up and enjoy rotating between about 6-7 different PV's at a time, but these are good for going out and about too, take a few vapes put it down, come back to it a few minutes later and hit it again a few times put it down, as far as getting the Oring off the ceramic cup I just use a long pair of pointy straight tweezers and pry the O ring to the side kind of pinching it and prying up at the same time and once you feel it break loose your cool to pry up the rest of the way, then I put the small one back in just so I don't leak when I set my PV down. They sure are a different kind of vape though, very smooth and no filler in your carto is quite different