I bought the Atlantis and I must say I am disappointed. hopefully, I am just doing something wrong and you can help me fix it. The problem is that I have to change the coils every day or two at the most and I have no idea why. I get a bunch of black sout that accumulates in the center of the coils and after a day it it hard to suck, so I have to change the coil. These coils are expensive and I find myself spending way too much money on this product. I cannot continue like this. I read in one of your posts that you recommend replacing the coil after 50 refills..... I WISH I COULD GET THAT.. I get maybe 8 to 10 refills... I have an IPV 25 battery.. I usually operate at 20 watts, sometimes as much as 22 watts.. please help me figure out if I am doing something wrong or if these products are produced poorly?