I've been looking into Vivi nova and similar systems recently and
ckone180 has a good easy fix to the
hardware that will allow it to work with VG liquids. I've experienced the same issue, now that I've tested the devices. There are many devices constantly being made and sold, so I can't test them all. This is why I advocate engineers of devices to test them on the few e-liquid variations there are (3) as it is a much more logical process than a liquid vendor retroactively finding the faults and reverse engineering a solution.
An e-liquid is a simple thing. There is a base, flavor, nicotine... only three small things to account for in 3 possible variations. With a little understanding of viscosity, absorption (the permeation of a liquid through a medium a.k.a. "wicking"), air flow, and reverse pressure we can eliminate any variations in a juice between the MOST viscous and the least viscous. This leaves 2 possibilities that an engineer has to account for (thick VG bases and the thinnest liquids available, likely PG and distilled water base.)
Maybe I'm distilling this issue down to basically...