I think like most, who maybe has been rebuilding for a couple or few years used to do true micro coils, I think when I first started with the kafun and micro coils, I was doing 1.4 to 1.6 mm coils and the tails worked perfect, but now the trend is bigger ID coils and there comes a point where to much wick tail is too much. Although i don't go bigger then 2.5, some do, and while that amount of tail may be ok in a dripper, I think it's too much in rta's. Granted, when most were using true micro coils, most weren't vaping over 15 watts or so, but now most are vaping much higher and I think the bigger ID coils handle that better. My average wattage is about 24 but if I was still vaping what I was a few years ago, let say between 12 and 17, I think I would still be using smaller ID coils. Actually I'm not really sure about that because juices have changed a little to, I think now, more and more juices are higher in VG .
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