can I ask which cartos you use?
I use cartos from Revolution Vapor,,,,,,,,
I just fill them and go,,,,,,,,,
they have their own downfalls, refilling frequently, for example,,,,,
but they don't taste burnt often, they don't leak, they are easy and simple to fill,,,,,,,,,love them.
20 for 20 bucks, and if you buy 2 packs, the shipping is free,,,,,,,,,,