I bought one of these tanks a few weeks ago and here is the problem I.m having with it. After a few days of vaping on it at around 30 to 35 watts I get a bad burnt taste. I have changed the atomizer head twice and the same thing happens after a few days of use, the burnt taste comes back. I love the vapor production this little guy puts out but I hate the burnt taste. has anyone else had this problem. And are there any other heads that will work in this tank. Thanks for any help I can get.