Ill be honest. My wife usually makes puts the coils in the rda's usually and i dont know much information about building. I was shown as she was by our local vape shop. We have been using twisted messes and have had no problem with it as we never have with another rda which is cheaper. I just got the cheetah obs in the mail today and was so excited for something new not too expensive. I built it myself everything looked great and then tested it without the cotton on because i was told thats the best way to do it. I hit the fire button and it immediately took the coild on one side and squished it together almost like a ball from 2 sec on the fire button. Then i remade it looked great again actually better than the first time then it said OHMS too low. Sooo i was told u could have any omhs and use any coil im using the alien 220w my question is why did it do that and im honestly scared for it to blow up if i make another one. Does it matter what coil i use and what ohms?? And what do you think happend what did I do wrong? Thanks.