How often do you burn gunk off your coil before you change the coil out? I have been dripping various flavors, one mainly which is bobas bounty. It is a 100% vg juice which from I under stand vg gunks up coils pretty quick and pretty good. My coil is about 4 days old built with silica wick. If I can just burn the gunk off do I have to change the wick? Or do I need to wrap a new coil?