Thanks guys. It's working well. My only issue is a bit of flooding, but I'm doing my due diligence with research. From what I can tell with the .5 ohm coil, my low wattage (7W) setting, and lower VG fluid, I need to slow down on inhaling. Slower inhaling seems to reduce crackling and flooding.
Oh well. Can't have it perfect on a used setup and three days in. Patience.
7 watts on a 0.5 ohm coil is less than 2 volts. I would recommend upping your wattage a little, honestly to get a more satisfying vape, but also it depends on the nicotine level of your juice. With a .5 ohm coil, I would recommend about 22 watts or so. But I wouldn't recommend juice above 9mg at that wattage.