Those BVC coils are great, but prone to flooding. You notice it more too because there's nothing on top of the coil to stop the juice shooting up into your mouth. I had a lot of problems, but figured out a few tricks.
When you put the tank together, make sure you screw it down tight. When it floods, try firing it a few times to burn off the excess juice. Turning up the voltage will help here too as it will get a little hotter. If that doesn't do it, take the tank off, take out the coil, and clean under it. Then take out the drip tip and clean under that too. Put it back together and fire it. Still no good? Wrap a paper towel around the air flow holes (open to the largest) flip her upside down, and blow through it. If you hold it normally, you'll just blow more juice into the coil.
If you're flooding a lot, open your air flow all the way. Essentially, you're creating too much suction when you pull on it, drawing too much juice into the coil. Draw slower and lighter. You'll draw longer, more like a dripper. Think sucking through a coffee stirrer as opposed to a soda straw. Also, you can open up the corner of your mouth to get more air flow/less suction.