I just got 3 packs of this resistance and out of 6 cartos only 3 have worked. When they work, they are fabulous!! But 3 have given me horrible burnt wicks after 3 puffs. I am filling correctly upside down and filled full. Getting bubbles out of syringe before filling. I even let them set for a bit before use. I am not sure if these resistance are worse, but I have heard better reports from the lower resistance ones. I am vaping at 3.7 so not trying to fry them! LOL I took the one burnt one apart totally and the wick was crispy black and fried after 3 puffs, I had 3 do the same thing, any suggestions?? Why is this doing that?? Thanks, bnrk