Hi All...I have three brand new protanks purchased from fasttech. I loved them for all of three days and then tonight I got the horrible burnt taste from two of them. I took apart the replacement head and sure enough they are singed beyond belief. I am using them on an ego twist at 4.8 Am I doing something wrong? a lower voltage leaves me wanting a bigger hit. I am waiting on an SVD to arrive from fasttech. They are real Kanger products or at least they have the stamp. I don't want to be replacing coils every three days, any advice?