I recently think I had a unicorn coil. In my Baby Beast, it was a Vaporesso GT4. It lasted 5/6 weeks and I only Hometown Hero witch doctor. I used it at least every other day, small sessions with it. Some days longer. It's the only coil for me personally that lasts over a week. I also use mostly highly sweetened juices, so that's why I use the Baby for this e-liq only.
So I've tried multiple Smok and Vaporesso coils, even in my NRG tank. Haven't had good luck with any coil in the NRG. They either burn/dry hits or flavor highly muted.
Ive tried multiple surgeries on the coils, with little effect or flooding issues. Then I saw a comment recently on utube about poking holes in coils and I tried it. Going on 2cd week with a Smok T6 coil in NRG.
Instead of poking holes all the way thru (top and bottom) of wicking ports,, TRY poking hole at top and bottom just shy of going all the way through. I think the idea is to separate cotton just enough to allow better saturation in between the two layers of cotton vs allowing a straight through flow to ID.
I had shelved my NRG and Big Baby and thought I' try it this way. I even used a sweeter e-liq and I've ran 3? juices to push my luck.
IDK if this method will work for all coils, but worth a try. I also run the coils at 5 to 10 watts below recommended, but this T6 I was able to run it at recommended best. T6 coils only used to last me 2 to 4 days before I had to switch. I hope this wasn't another unicorn, stock coils are too expensive otherwise.