on my kfl+v2 i change the wick every 2 tanks, and the coils ever 2 wicks aka 4 tanks. I change it ever 2 because sometimes on the 3rd I get some dry hits and the flavor is slightly off (not bad or burnt, just off). I change my coils every 4 tanks just because I figure I should. Does this sound normal? too frequent? ew gross change it more often!?