Using it on an eGo Twist with Halo's Shamrock liquid, and I'm either getting no flavor, or if I turn the voltage up high a bit of flavor and a nasty burnt taste. Already tried taking out one of the top wicks, and it's still flavorless/airy. It produces plenty of vapor, but that's all. Bought 2 of these with my new Twist expecting to love them, and they're completely worthless. Anyone have any advice?