i have a provari and a zap that im using 32 ga and ss mesh. im using 18350 and 18490 batterys and im getting really short battery live. i have a 2/3 wrap its coming out to about 1.6 ohms. i get maybe 2-3 hrs max out of the 18350 battery and maybe 3-4 out of the 490.. im runnin at 4 volts.. is this normal? if not what do i need to do different?