I am wondering if the aste problem may be due to the VV device? I have found that wattage device tend to be much more intuitive and adjust power to fit their attached devices better. Also some tanks, at least in my opinion seem to work much better on voltage (mostly older), others tend to work much better on wattage. I bought my wife an aspire K 1 and she really likes it. It utilizes the same BVC technology as the nautilus but in a ego size tank, pyrex and very nice little tank for the money.