I've become a convert to tanks myself, although I still on occasion have issues with dry carto (usually with darker or thicker juices, though). And I vape at or around the same amount... I just don't have to "top off" anywhere near as often.
Once the carto's free of that top ring, be very very careful, because the juice can easily lubricate its downward passage. I tend to literally slide down the carto about an inch off the top of my cutting board, just because if it slides too fast, it makes contact with the board, and it keeps the top of my carto from popping free of the tank and making a mess. However, I have tiny hands and am stubborn. This may or may not work for anyone else.
