You may be still getting to much nic. try going to Walmart or Walgreens and grab a bottle of Glycerin from the pharmacy. I believe its Humco brand. Maybe try diluting it to 3mg. half and half in the Atlantis tank and try that. I had to do that when I tried dual coiling my Reo for the first time. I vape 12mg normally in single coil mode, but am weening down to 6mg. I had to dilute it down to 3mg when I tried dual coiling as it was still way to harsh and made my head swim at 6mg.