I ran my first full tank and then refilled it and it started to taste kinda burnt. Is that usually how they need to be refreshed, 1 tank? I ask because it seems a bit quick and when I took the first few hits of second tank I got dry hits so thinking I could have burnt the cotton a bit and thats why. The first full tank was unreal, now I see why everyone loves this device. So anyway let me know how many tanks you generally can get out of fresh organic cotton wick, and approx what your coil specs are. Thanks