Hello all. I joined several years ago but didn't fall in love with the vape options at the time. I came back to it a couple months ago, using the ProVari mod and a t-dux 4 tank. I've gone through ten 2.0 coils in two months since they tend to either lose all flavor or, worse, produce a burnt taste after a few days. The vapor production stays pretty good throughout, though. I read somewhere about soaking them in alcohol over night, which I've tried with minimal success. I've been using 70/30 juice and have experimented between 3.5 up to 5 volts. Is that to be expected with these coils? Is there a better cleaning method? Any help would be greatly appreciated.