I'm also disappointed in the Nautilus BVC coils. At first I thought I found the answer to better flavor than the BDC setup in the 5ml Nautilus tank. First of all I'm a chain vaper. And for the first several hours the flavor is the best I've had from the Nautilus. Wow this is great. Then it seems like after a day or so, they start going higher resistance and plugging up making he draw or vape and lot harder and almost impossible to get a good hit after the second or third day until a new coil is installed. Well 10 days later I've going through ten coil heads. At first I was hitting the 1.8 ohm coil with 8 watts for 1 second, 6 watts for 1 second and then the remaining wattage at 5.2 watts. At higher wattage's they go high resistance and plug up even faster it seems. This has worked out great using the BDC heads giving longer coil life in the past for me on a Joytech Evic in automatic Variable wattage mode. After going through a a few BVC replacement heads I tried higher wattage in direct wattage mode and lower wattage in direct wattage mode all with the same results. going through replacement coils every other day is NOT going to do it for me. I've tried 50/50 pg, and 60/40pg juices. So the BVC coils is a fail in my opinion.