I am fairly new to vaping, my buddy sold me an itaste vv for $5 and a 10ml bottle of 24mg juice. I currently only have a CE4S 2.9ohm tank, I find that I get the best vape between 3.7v-4.0v on this tank, which is 4.7W-5.5W but my itaste only goes down to 6W. It seems that the variable wattage is a wasted feature on this device since any safe vaping chart says the best vape is below 6W. I have seen people say they like it around 8W but mine burns almost instantly at 8W. Do I need to get a better device?