The secret to using a bottom coil is never letting the tank get even close to empty, and cleaning the atomizer heads after 1-3 tanks of liquid depending on the viscosity of the juice you use.
I have a couple of top coil clear tanks too. I have always had more dry hits with top coils than I have with bottom coil systems. But I also have far fewer leaks with top coils than bottom. As soon as one of my EVOD or MT3's gets below about 1/4 full, juice starts making its way through.
I've adapted a bit by adding a small amount of cotton cheesecloth wick across the top of the main coil/wick twist. That has extended the life of the heads from weeks to a month or more.
I have a couple of top coil clear tanks too. I have always had more dry hits with top coils than I have with bottom coil systems. But I also have far fewer leaks with top coils than bottom. As soon as one of my EVOD or MT3's gets below about 1/4 full, juice starts making its way through.
I've adapted a bit by adding a small amount of cotton cheesecloth wick across the top of the main coil/wick twist. That has extended the life of the heads from weeks to a month or more.