The ViVi Nova is the best, hands down. But what i cant understand is that usually i have a solid draw and good vapor...but their are sometimes the draw doesnt seem to have the vapor volume and I can hear alot of air when inhaling like its got a air leak or something. Does humidity have a impact on this? The PG/VG is always 50/50. My set up is always the same, vaping from a VMAX at 4.1V. Anyone else have a inconsistant draw from the ViVi Nova 2.5?