I have watched video reviews of the kgo which helped in my decision to purchase, I do notice that when I press the button I get the loud crackling or hiss of the vaping but the sounds crackling sound drops off almost immediately to where I can barely hear it. In the videos I hear the crackling sound and it never drops off and maintains just as loud through the whole pull. Is this because I am using one of the pre filled cartos? Or is this something else. I charged the battery until the light was green on the adapter, so I would imagine the battery is as charged as its gonna get... Thoughts?