I have an eleaf istick 100w with 2 efest 18650 3.7v batteries and a uwell crown tank that I use 0.5 ohm coils with. I have recently started getting a burnt taste. I have ordered new juice through a different vendor to see if that is the issue but I really don't think it is because He has made me 3 different flavors with different nic levels but I'm gonna test the new juice tonight. However, I have always kept my watts around 54 which reads as 5.2 v but since the burned taste started, I have it lowered to 44 (4.7 v) and it's barely hitting. I don't know if it's the coils or the batteries. I know how to prime the coils, have been doing this for over 2 yrs and have never had this issue. However, I am starting to question the ohm. I've just always used the .5 ohm but it is possible I'm using the wrong ones. PLEASE help me I feel like I've been living a "lie" for yrs lol