I feel like I am filling them correctly this time but some of my cartos taste burnt. I have 10 and they were all brand new. I opened each one of them up to test them and only 3 of them have a good smooth taste/throat hit with a lot of vapor. The other ones taste like burning metal, have very very very little vapor and the throat hit feels like I am inhaling a sheet of burning construction paper. Does anybody know if I am supposed to do something to the cartos before filling them up?