Sounds like the same issue ProTanks on ProVaris had until the airflow valve.Some ViVi Novas have airflow issues on a ProVari. It's a known problem. Sometimes unscrewing the Nova just a bit to allow for more airflow will fix the problem--sometimes it won't. If it doesn't, you may try getting a 510>510 adapter.
http://www.e-cigarette-forum.com/fo...-vivi-nova-really-tight-draw.html#post7379513
What I did to fix that before the valve came out was fold a small piece of paper a couple of times into a strip and place it between the tank and the device when screwing the tank down. It allowed enough airflow in without making the tank wobbly on top.
It's a free fix to try, anyway...LOL
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