I happen to love this really thick, vg black coffee e juice in my tanks, on my Provari, and the cartomizers start out at 2.5 ohms, and then after I vape them for maybe 20 min, they all drop down to 1.8 or less and I can't vape at 4.5, which is my happy spot. I can't figure out what is going on. Is it too thick? Too black? What? I have gone thru so many cartos this way and I'm just constantly throwing them out. I can't vape pg, I develop mouth ulcers. Maybe a blend would work. The stuff I am buying is from Velvet Vapors, it is called Java, and Capuccino. I love them but they don't love me!