For those of you who use tanks, do you top up frequently, like I do? Usually by the time my tank is half empty, I pull it apart and top it up. Am I the only one? I find as I reach the bottom, the flavour changes a bit, and the constant topping up helps keep the flavour tasting good for longer on the same coil. My nautilus coils last over a month each. How do you refill and why?