So I'm vaping an Aspire nautilus with a ProVari mod at 3.5 volts. I looked at a chart online which indicates that this produces nominal functionality. So here's my question: At these settings the unit produces a consistent low gurgling/poping sound. It's always a uniform noise, never louder or softer. Is this normal? I conjecture that this is the coil atomizing the fluid. I also figure that if I don't hear the noise, I'm flooding the coil which could lead to scorched fluid. Am I on the right track? Any help would be appreciated!