Hmmm, judging by the tone of that post I get the sense that mine came off as a little high on myself, my bad, I apologize. In answer to that though, and why I don't understand the issues people seem to be having, I didn't think I was doing anything special to fill my tank. I do not close the flow control, I get my syringe filled and ready, unscrew the fill-hole, quickly fill my tank and replace the fill-screw. Why I do this quickly as possible is because I have learned through experience the longer that fill-screw is out, the more likely the Killer is to leak (seemingly with or without the flow control closed), but done swiftly I have no issues. That's about it really, I keep the flow control just less then half-way open for 60/40 juices, and proceed to vape my face off for a whole day before I need to refill. My wick/coil setups are lasting me 1-2 weeks before I feel like the could be better and rebuild them. I wish I had some enlightening trick or advice, but as far as I know, I'm just doing what I've read/watched should be done.