i have had no problems with dry hits. i do use a 70/30 pg/vg mix however. i don't know how they would handle high vg juices. try to keep the
tank at least half full, and tilt them often to keep the top part of the wicks saturated. in my experience, they have performed better than the kanger stock coils, but not as well as the kanger coils when i rebuild.
i usually wash them after four or five
tanks, air dry and dry burn before next use. the coils last me a long time ( a month or so, before i change coils ). i vape at 8.5 watts btw, with longish drags every 15 seconds or so, the way i used to smoke a cigarette.