I recently purchased a KGO kit and didn't like the atomizers that came with it, so I got some smok dual coil cartos, filled them up per instructions (drip until it starts to come out bottom, clean off excess, wait a few minutes). Once I get it going, the vapor it produces is inconsistent. Sometimes I get good, clean vapor. Other times, I get little to no vapor, but instead a harsh almost liquidy pull that hurts the throat/lungs and produces no vapor. It also seems that the cartomizer is making a very loud clicking noise every time it fires up. Anyone know what I am doing wrong?