Maybe its the way I fill then, I put the plug on the battery end of the carto, remove the hard cap and the O-ring, then slowly spin the carto and drip, when the liquid pools on top I use centrifugal force to get the liquid down the filling, I always put around 30 drops with this method. Maybe I got a bad batch of cartos, I don't know.
Anyway, I'm looking into the the GreenCig cartomizers to use on my KR808 batteries because burning the filling and inhaling that worries me quite a bit. I've noticed that even cartos that didn't taste like burning had some burning marks on the filling touching the coil after a little while. I didn't top those though, didn't really know I had to until recently.
I know that I'm quite off topic now but do someone have experience using Greencig cartomizers? Is there something I need to know if I want to use them on my KR808 batteries or do they just work out of the box? Is it possible to burn the filling?