All of a sudden I'm having trouble with my 2 Cleito tanks. My initial coil that came with the units didn't last long (2 days on one and 4 on the other, using 15mls of juice between the 2 tanks) and then some other coils were lasting about a week. However, the replacement coils I've bought seem to be giving me quick trouble. I put a coil on last night and now it's giving me inconsistent hits and tons of spit back. Another coil also give me fits pretty quickly as well. Am I doing something wrong or is it the coils? I keep an eye top and have try not to have it too tight but I do notice a fair amount of air bubbles when I loosen it (does this mean I'm still keeping it on there too tight?). I'm vaping at 60 watts which is the top range of the .4ohm ratings from the company and I use a 70/30 VG/PG juice. Just wondering if I've just got a batch of bad coils or if it's me. It's getting pretty frustrating.