What's going on with these heads is after a couple tanks worth of juice runs through them they begin to get a carbon color buildup on them. This is what starts to give you that burnt taste. I have seen this on the single coil and the dual coil heads. You can rebuild the dual coil heads I have done so successfully three times now. I also have one at .9 ohms but am making additional holes for juice flow cause two just won't keep up. For the single coil heads I am using 30ga kanathal by its self no non resistance wire. It works great and is easier to clean between tank fills. I will do a tutorial in the future with good pics and possibly a video. This saying that taste is subjective is not truly correct. Example chocolate tastes like chocolate no matter who ie eating it and most things are like that. So juice should be the same way. How we vape the juice is what is subjective because your preferred method may not be my preferred method. I think what we really need is a variable temperature device customized to the juices we enjoy vapping that would be a game changer for sure.