Wow. People rave about them because they just plain work well.
You definitely have some kind of issue but hard to diagnose without seeing it.
I have 4 of them in use between my wife and I (and Mini's). Here is a picture of one I rescued from my wife to refill. She was still vaping on it.
I use either the 1.8 ohm head at 3.4-3.8 volts or the 2.4 ohm head at 4.1 volts.
No leaks, no burned hits. I put a drop of juice on the coil and wait a couple minutes and vape away.
I have noticed it takes about 0.5 ml to "break in" for best flavor/vapor.
They work well for you, sir. And I'm happy to hear that. Unfortunately when i look at the Tank Issues forum, it is littered with Vivi Nova problem threads. This would indicate that this piece is far from consistent.
Sent from my Galaxy Nexus