I've found this with my crown:
* The included vapesafe fuse makes it misfire all the time. I've cleaned the contacts on it multiple times, nothing seems to help. If you don't use this fuse, it works much better.
* The variable wattage mode does not work with 3 ohm boge cartomizers. The vape is a lot weaker than using the same wattage on a 2ohm cartomizer.
* Variable voltage mode works much better with the 3 ohm cartomizers.
If I set the crown to 10 watts and use a 3 ohm cartomizer, the vape is cool and not that great. If I set it to 10 watts and use a 2 ohm cartomizer, it's burnt. I've emailed Artisan Vaping about this, and he had no help other than to say "make sure your contacts are clean". It was implied that it was my problem and not the Crown's, but I don't know what I'm doing wrong. Obviously my contacts are clean and making a good connection.
Edit: I'd like to say that I don't have this problem with the kick. The vape is virtually identical when using a 3ohm cartomizer or a 2ohm cartomizer, set to 8 watts.