DON'T TURN YOUR VOLTAGE TOO HIGH, OR YOU'LL BURN THE WICKS AND THEN YOU'LL GET NOTHING !
I've vaped Boba's & others VG juices with my Vivi's. It works fine, BUT I wasn't getting the full range of flavors I get from a carto tank(Boba's tasted like pure honey, nothing else). A carto tank can be heated up a lot higher without burning anything.
You can also try adding the minutest amount of distilled water( a few drops) to your tank.
Again, don't burn your wicks with too much voltage (not over 3.6 probably on a 2.2-2.4 ohm head)