So I've had this tank (Vaporeeso Estoc Mega) for about a month now and gone through 8 coils (0.5ohm ceramic euc coils rated 25-35 watts). All of these coils have been perfect, perfect, perfect. Amazing flavour and vapor. 2 days ago I was using it on my kanger subbox while waiting for my xcube ultra to come in the mail. The coil I was using was going perfectly but it felt a bit harsh and I felt it needed to be changed. So I took out my 9th from a pack of 10 and it felt so different. By different I mean it didn't sound the same as the previous ones (made a nice crackle but never spits liquid up) and the taste of my juice wasn't as strong with a slight burning sort of taste. These coils do have some cotton in them and I'm sure it wasn't he taste of burnt cotton. Once I received my xcube I tried it again and had the same effect. Tried temp control mode and it was a bit better but still shitty compared to what I had the first 8 coils. Tried turning the wattage up to 50 and the juice taste was there more but so was the weird burnt taste. Tried my old coil, the 8th and last good coil and surprisingly it still worked fine. Still harsh but was working as expected unlike the 9th coil. So I tried a 10th coil hoping the 9th was just a bad coil but I had the same unpleasant experience. Went off and bought a new pack of 10 and I've tried 5 of them to have the same thing happen! With my first 8 coils I didn't even prime them I just put them in, filled the liquid and it was good to go every time. With the last 7 coils I've tried out I have experimented with priming and without to no benefit. I've tried cleaning the tank out and boiling it and putting a new coil in again with the same results. I'm stumped now . Tried going back to Clapton and titanium in my griffin and sun tank and I couldn't stand it after my good times with ceramic! When it was working out for me it was just too good and I really want a solution. At the moment I've bought a second estoc in hopes of a faulty tank but will be waiting a week or 2 to get it in the mail. I couldn't even find a relating topic on the web so I'm hoping for some positive feedback here, fingers crossed!