I have noticed that when I use my pass-thru that my cartomizers taste kind of burnt. The flavor that I get with my regular and short battery is drastically different. Plus, they get really hot, and I have to change the carto frequently, so it dosesn't burn my lips. I'm not sure if it's a faulty pass-thru or if this is the norm. Does anyone else have similar issues, and or soliutions to them?